Gran Turismo PSP Gameplay.
The Playstation Europe Blog also answered some questions on what features will be in the PSP version, mainly;
Only 4 cars on track
60 frames per second
And still no damage
Still despite some of the bad news I still think its a technical achievement that they got this much into the game at all and as you can see in the video above it looks as smooth as ever (and also as difficult)!