The Gadgeteer: Information for people who love gadgets and gizmos.
Handango: The largest collection of handheld software on the internet, plus hardware and accessories.
MemoWare: A collection of thousands of documents (databases, literature, maps, technical references, lists, etc.) specially formatted to be easily added to Palm OSŪ, Psion, Avigo, or WinCE devices. The documents available come in a variety of formats and cover a wide range of topics.
mytreo.net: A huge site with articles, news, how-to guides, and a very active disussion board.
Palmsource: Maker of the Palm OS operating system. This site offers software, how-to guides, user group listings and
PDA Verticals.com: A family of websites that focus on specific vertical markets e.g. PdaJD.com, PdaED.com.
PocketGoddess: Devoted to handheld (PDA) news, reviews, and feature articles, plus the occasional contest and plenty of software giveaways. While the focus is generally on the Palm OS platform, you'll also find articles on Pocket PC, cell phones, and wireless/mobile technology of all kinds.