Xfer a PIXMA iP4500 from MacPro to a NAS (SimpleShare)--How do I?

Question

I've absolutely been crushing my head against a wall here. Finally gave up and called Apple. The first gal couldn't comprehend the concept of NAS attached via ethernet to a router [it would be amusing if it wasn't so sad--in her world, there are two ways to hook up a printer: 1)wirelessly {bluetooth?} and 2)USB cord]. The second guy couldn't help, but at least he wasn't blown away by the idea of an ethernet network. He suggested I try these forums.
I moved this printer from a direct USB hookup on the back of my MacPro to the USB input on a networked external hard drive. The NAS sees it, and lists it in the printer pool (instead of the HP it replaced). I have tried to set it up in Leopard>System Pref>Print & Fax via IP, and get the timed out error others describe in this forum (Attempting to connect to host 192.168.2.xx=>Network host '192.168.2.xx' is busy; will retry in n seconds...). I tried More Printers, nothing listed, everything gray, only option is to cancel. I even tried Windows, nothing there either, not even the HP Laserjet 4L I have hooked up to another (XP) laptop. I've seen the suggestion to make sure we're all in the same Workgroup, but have no idea where to find and edit that setting.
I'm open for all ideas--another post said to try enabling all incoming connections in the firewall--I tried that too...
Incidentally, this is how I got so good at Windows networking...it's fascinating intellectually, but frustrating because I've got other things to do with my time, and I shouldn't have to be an expert to use an Apple (BTW, the fact I knew more about NAS than the tech support was alarming to me!!!)
Thanks in advance, and don't be miffed by the tone (it's in case any Apple management types are trolling to check for customer feedback).

Answer 1

My attempts from last night did not work. I suspect I have driver issues. Even though I downloaded both drivers available here http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=SupportDeta ilTabAct&fcategoryid=257&modelid=15596, I don't know what driver Leopard is trying to use. Canon IJ Network is one of the options I can get with the doubleheaded arrow under Sys Prefs>Print & Fax>More Printers, but nothing shows up. I don't know what Canon driver I currently have (nor where to find that info).
Trying to get info from SimpleTech (the maker of the SimpleShare 160GB NAS I have) yields this tidbit for Tiger or Panther or Jaguar on pp 20-21 about adding a networked printer on Mac OSX: http://www.simpletech.com/support/guides/user-guides/61600-00074-001.pdf, but it was sufficiently different than Leopard that I couldn't use it. I tried modifying what's there, but see my comments on Sys Prefs>Print & Fax>More Printers.
I found out about Gutenprint on another thread and went here http://gimp-print.sourceforge.net/MacOSX.php3. Now I'm wondering if I should just install Gutenprint 5.0.2 (what's the difference between that and 5.1.7? Why would they be developing both simultaneously?) and see if the open source drivers there can take care of the problem (I understand that strips out OS X's gutenprint drivers and replaces them with more up to date ones).
BTW PAHU, I don't see App>Utilities>Directory... I have Applications>Utilities>Directory Utility, but going in there shows nothing (even though I have separately mounted the SimpleShare drive on my MP).
I don't know if I mentioned it, but on my XP laptop I installed Bonjour, so maybe that's another reason the workgroup showed up in Sys Prefs>Print & Fax>Windows. In any case, it says it worked but in reality nothing printed (it was showing as a completed job).
In summary, I don't know how to find out what driver I have. I don't know what driver I need. And I don't know how to add the printer via the NAS' printer server, even though I know its IP address and that it can use Samba.
I appreciate anything anyone can throw my way.