I've been a huge Palm fan for over ten years. Although they have gone dramatically downhill in the last 5, and their core software hasn't had a useful upgrade at all in the last decade, I continue to use it. Though my Centro will probably be the last Palm device I ever own as I've pretty much lost all confidence in the Palm brand.
For those of you still using PalmOS, beware of a service called GooSync. It promises to synchronize your calendar, addressbook and todos with corresponding google web apps.