Simple explanation for this "phenomenon:" Wii is selling better than people thought, so more developers are jumping on board. PS3 was expected to do well before the launch, so many of it's announcements were made before launch (MGS, 2 FF's, White Knight Story, Ninja Gaiden). Anyway, I think you have to wait till E3 anyway in order to really understand what support is going to be like for each of the systems during the last half of this year.
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.
Essay Pro