Taking my Palm Treo 600 apart a few months ago took a lot of time, as figuring out all connections wasn’t exactly easy(teardown pictures can be posted if you want them). A “maintenance guide” would have been worth its weight in gold.

Apparently, a few RoHS-crazy individuals at Palm’s have decided to offer us exactly this(a tear-down guide) on their Environmental Programs page. While there still isn’t a PDF for the Treo 680, the takeapart process for all other recent Palm units is covered there in considerable detail:
http://www.palm.com/us/support/contact/environment/instructions.html

Have fun taking your handheld apart - and be careful not to break it!

Just in case: we are not responsible for whatever you do with these files!