A while back, Technical Evangelist, Lynn Allen, developed a Tips and Tricks Guide for AutoCAD 2007. It is available as a PDF file.
AutoCAD 2007 Tips & Tricks PDF
I recently posted an article, Wikipedia: Appropriate for Autodesk documentation?, which posed the question of providing Autodesk documentation in Wiki format. As a test of what something like this could look like, Autodesk Singapore Product Designer, Tuan Anh Tran, developed a self contained HTML file that is a version of Lynn's PDF file.
AutoCAD 2007 Tips & Tricks Wiki
This file could be hosted on a server in wiki format. Just imagine if experts from around the world could add new, update existing, and remove obsolete content from such a document. There's more than application development alive in the lab. We're concerned about the documentation too!
By the way, Lynn now has an AutoCAD 2008 Tips & Tricks booklet available.