Palm IIIx - excellent, but looking to upgrade to the new M505 with colour and more memory. Connects by Infrared to my Nokia and downloads my email. Lets me input all my flight times. Never lets me forget a Birthday or meeting, never lets me forget a phone number. Beams phone numbers by Infrared to my phone. Syncs with my desktop PC in seconds. Is small enough to fit in a shirt pocket. Is light and robust.
Downside - No keyboard but you can get a fold up one for the rare occasion that its needed.
Palm can be Operating system upgraded, Handspring cannot. New Palm M505 allows addons like the Handspring.