the whole point of GOW2 is to keep the PS2 alive as long as possible in order to help keep the Sony games division afloat. you'll probably see PS2 sales jump a little in March, and GOW2 will probably sell somewhere between 2.5-5million copies producing a total revenue of $100-200 million. Considering it is a last-gen game using the same engine as the original game, it probably cost Sony relatively little to produce, so Sony's gonna make a killing off this one title, which should help diffuse some of the losses due to the PS3.
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