Cleaning up mac book air for sale

Having upgraded to a new Mac Book Air, I'm preparing to sell my old one.  There are various places that advertise selling used Macs.  Some of them are advertised by Mac Life Magazine.  I'm going to check out these places.
But next comes the question, how do I prepare it to turn over to the buyer?  The only mass storage going with it is the SSD that is built in. 
One approach that seems obvious to me is to wipe off all my files.  By this I mean deleting everything under my Home directory and all the applications not part of OS X.  Disk Util has a feature to erase free space.  So if I delete the personal files and the applications I bought and then empty the trash, all the sectors which might contain the files in question should be in the free space.  Disk Utils erase free space should do a good job of cleaning up the remnants.
Any comments or suggestions about this.  Doing this instead of using a Secure Empty trash means that the remnants of files I deleted months ago are also cleaned out. 
Now what else do I need to clean out?
How can I clean out securely things on my Keychain? 
How do I get the system to forget my Apple ID?  That is no one else's business.  Obviously it needs a password but not letting them have the ID is one more step to being secure.
What else is on my system such as user related settings that are not stored in the home directory but in some system directory that I need to consider.
I guess I'm being a bit paranoid but there are people out there who do remarkable and scary data recovery stuff. 
Thanks for your help.
Bruce

For some helpful tips:
This does not answer all questions you asked.
http://www.reedcorner.net/how-to-prepare-your-mac-for-sale/

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