Palm Advisor will help you find everything for your PalmPilot - programs, software, downloads, peripherals, accessories, cases, cables, etc. Plus, information, tips, tricks, and techniques. Not to mention - great deals at great prices!
http://www.PalmAdvisor.com/

Pocketwares is a directory site containing only pocket pc and PDA software, from applications to games.
http://www.pocketwares.com