Currently picking my way through Dirt 2 (about 55% complete) after finishing GRID. Both amazing games (so long as you like driving). These games are the reason I have a 360. My only complaint (if there was one) with Dirt2 is that the atmosphere is kinda "bro" but I can overlook that for its great driving... from what I hear Codemasters have took that to heart and 3 is going to involve more terrains and be slightly more serious.
Dirt 2 is awesome. I got into the game through a D2D sale for $10 on the PC version. I need to get off my ass and grab GRID for PS3.
Damn, those screens look amazing! Especially the snow, they got some good effects going on in the 3rd one! Always loved Dirt, also played the demo of Grid and have always wanted to own it.