Advanced (or semi-advanced) OSX Books... Advice?

Hi people.
I'm hoping this is the right place to post... Basically, I've been using Macs now for 9 years-I'm a Graphic Designer by qualification, but in the real world, this just hasn't materialised. So, of late, I've been considering re-training, learning a new skill. And after some lengthy telephone calls and discussions with partners, elders, friends, I'm going to go down the Apple Certified Technician route. I love Apple products and hardware/software, and working with something I love being around sounds like a good career prospect. I'm young, no real commitments, and there do seem to be alot of jobs locally that ask for people with good Apple training/user knowledge, so I've figured why not.
I've been in-touch with an authorised training centre, explained the situation, what I'd like to achieve, and based on the user knowledge I have, which course would they recommend I consider. Basically the guy said that 'Mac OSX Essentials' is a good place to start. I'm sure at £950 it is! I can't help but feel a little intimidated by the cost, how much there is to learn and the fact the course is 3 days. Thats alot of cramming! So, what I'm trying to do is get some books about OSX so I can learn a bit more first. Thing is, it's alot harder than it sounds!
Basically, from my own experience-there are an abundance of 'Beginner' Mac books. There are also loads on PC > Mac. There are lots of specific books about iLife and related software etc. Heck, there are even books titled something like 'So you're a senior and you're learning to use a Mac'. All these books are great, but as I thumb through them, all the info is very basic and not as informative as I need them to be.
I want to learn more about OSX-how it works, why DU pumps out codes like 'dr-wr-wrx'. I want to know what they mean, why they change-I want to learn about system processes etc. I know all this stuff could be found on the internet, but I can't use my iMac on the train or in the canteen at work! I want a kind of book titled something like 'Advanced OSX' or something. I was wondering if anybody had a book they can recommend, or know of a book that may suit my needs-something I can carry in my rucksack so if I have the chance to have a read I can!
Sorry for the tragically long post...I felt the need to be very precise about my requirements!
Dan

I recommend doing the training that Apple suggests for the course and certification - links below. I would just use the book they recommend for that specific course. As quoted from the first link, "The primary reference for this exam is the book: Apple Training Series: Mac OS X Support Essentials (Peachpit, 2008)".
http://training.apple.com/pdf/support-essentials-sag-v10.5.pdf
http://training.apple.com/certification/macosx
http://training.apple.com/training/

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         at oracle.cabo.ui.laf.base.xhtml.TableRenderingContext.isRowDisclosed(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.TableRenderer$13.getValue(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.TableRenderer$TableBoundValue.getValue(Unknown Source)
         at oracle.cabo.ui.BaseUINode.getAttributeValueImpl(Unknown Source)
         at oracle.cabo.ui.BaseUINode.getAttributeValue(Unknown Source)
         at oracle.cabo.ui.laf.base.desktop.HideShowRenderer.isDisclosed(Unknown Source)
         at oracle.cabo.ui.laf.base.desktop.HideShowRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.XhtmlLafRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.TableRenderer$12.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.XhtmlLafRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.ColumnGroupRenderer.renderAsStackLayout(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.ColumnRenderer._renderKids(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.ColumnRenderer._renderContent(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.ColumnRenderer._renderTD(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.ColumnRenderer._renderDataMode(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.ColumnRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.laf.base.desktop.TableRenderer.renderSpecialColumns(Unknown Source)
         at oracle.cabo.ui.laf.base.desktop.TableRenderer.renderSingleRow(Unknown Source)
         at oracle.cabo.ui.laf.base.desktop.TableRenderer._renderTableRows(Unknown Source)
         at oracle.cabo.ui.laf.base.desktop.TableRenderer.renderTableRows(Unknown Source)
         at oracle.cabo.ui.laf.base.desktop.TableRenderer.renderTableContent(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.TableRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.laf.base.desktop.TableRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.XhtmlLafRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.apps.fnd.framework.webui.beans.table.OAAdvancedTableBean.render(OAAdvancedTableBean.java:780)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.BorderLayoutRenderer.renderIndexedChildren(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.BorderLayoutRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.XhtmlLafRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.laf.oracle.desktop.HeaderRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.XhtmlLafRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.XhtmlLafRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.composite.ContextPoppingUINode$ContextPoppingRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.XhtmlLafRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.XhtmlLafRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.BorderLayoutRenderer.renderIndexedChildren(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.BorderLayoutRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.XhtmlLafRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.XhtmlLafRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.composite.UINodeRenderer.renderWithNode(Unknown Source)
         at oracle.cabo.ui.composite.UINodeRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.oracle.desktop.PageLayoutRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.XhtmlLafRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.BodyRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.apps.fnd.framework.webui.beans.OABodyBean.render(OABodyBean.java:398)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderIndexedChild(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.DocumentRenderer.renderContent(Unknown Source)
         at oracle.cabo.ui.BaseRenderer.render(Unknown Source)
         at oracle.cabo.ui.laf.base.xhtml.DocumentRenderer.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.BaseUINode.render(Unknown Source)
         at oracle.cabo.ui.partial.PartialPageUtils.renderPartialPage(Unknown Source)
         at oracle.apps.fnd.framework.webui.OAPageBean.render(OAPageBean.java:3285)
         at oracle.apps.fnd.framework.webui.OAPageBean.renderDocument(OAPageBean.java:2936)
         at oracle.apps.fnd.framework.webui.OAPageBean.renderDocument(OAPageBean.java:2743)
         at oa_html._OA._jspService(_OA.java:101)
         at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:119)
         at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java:417)
         at oracle.jsp.JspServlet.doDispatch(JspServlet.java:267)
         at oracle.jsp.JspServlet.internalService(JspServlet.java:186)
         at oracle.jsp.JspServlet.service(JspServlet.java:156)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:588)
         at org.apache.jserv.JServConnection.processRequest(JServConnection.java:456)
         at org.apache.jserv.JServConnection.run(JServConnection.java:294)
         at java.lang.Thread.run(Thread.java:479)

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    Vishal
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