Programming Palm OS in a Nutshell: http://www.palmos.com/dev/tech/docs/palmos/Nutshell.html
Palm OS Platform Developers Web Page: http://www.palmos.com/dev/
The Palm OS Emulator HOWTO: http://www.netmeister.org/palm/POSE-HOWTO.html
The Palm OS Desktop HOWTO: http://www.orbits.com/Palm/PalmOS-HOWTO.html