Check out Code Project - lots of great articles on Palm programming: http://www.codeproject.com/sea...
Go to Sourceforge - it may take a while to pick through the weeds, but you should find some useful projects to examine the code:
C programming for Palm: http://onboardc.sourceforge.ne...
http://www.vb-helper.com/review_palm_ides.html -- a review of Palm IDEs - may give you some ideas
http://porganizer.sourceforge.net/ -- Palm Organizer has the essential files for creating a Palm program if you look at the bottom of the page
Try the 1stSource forums, check out the menu on the left for various Palm models and you'll be sure to find some useful info:
For some fun - and perhaps some code to review:
http://sourceforge.net/projects/phoinix/ -- Gameboy emulator for Palm
http://sourceforge.net/projects/palmapple/?source=recommended -- Apple II emulator for Palm
More emulators to consider: http://the-gadgeteer.com/2004/...
http://www.codejedi.com/shadowplan/castaway.html -- Atari ST emulator
http://frodopalm.sourceforge.n... -- commodore 64 emulator
Good luck and have fun!