Although the motion controls were solid in Galaxy, personally I don't think they were integral in making the game great. I think just about every motion aspect of the game could have been replicated with a controller without a big loss. With that said, the brilliance of Galaxy comes from the absolutely stellar level design. Never have I played a platformer with more polished and well thought out levels. That's the monumental achievement of the Galaxy team.
My Top 5:
Shadow of the Colossus, Metal Gear Solid 3, Shenmue, Skies of Arcadia, Chrono Trigger
My 2 nex-gen systems: PS3 
and Wii 
Prediction Aug '08: We see the PSP2 released fall '09. Graphically, it's basically the same as the current system. UMD drive ditched and replaced by 4-8gb on board flash memory. Other upgrades: 2nd analog nub, touchscreen, blutooth, motion sensor. Design: Flip-style or slider. Size: Think Iphone. Cost: $199. Will be profitable on day 1.
