Here's some anecdotal evidence. I have a 46" Bravia XBR2, 40" Bravia XBR2, and a 36" Samsung (not sure the model, but it was the latest one that came out last holiday season). All have great picture quality, but IMO the Sonys outclass the Samsung. It's a slight difference, but the Samsung seems to have more "artifacts."
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.
