No comparison between the Clie N610 (or 760) and the Palm M505; the Palm has a lower resolution screen, and both the colors and brightness suck big time on the M505. Both Palm and Handspring are now lagging behind with their current PDA's. If you want a Palm OS-based PDA, the Sony Clies are the best choice!
But I am seriously thinking of getting a PocketPC once they become a bit smaller (probably in a year time frame); there are all kind of video game emulators you can find on PocketPC, including an almost perfect version of the TurboExpress (handheld Turbografx-16) system; the funny thing is that the Pocket PC itself is smaller than the actual TurboExpress! For now, the Sony Clie is my first choice (smaller than PocketPC's, beautiful screen, and affordable).