A few things to add to the Gamespot review ...
The HUD is also centered properly with 3 screens running. There is no compromise made at all for the user with surround video.
2) The "aliveness" of the environments has to be seen to be believed. I've never seen so much organic-looking movement - from windblown banners to dust and water that behave very convincingly.
From a purely visual standpoint, Dirt 2 is a knockout. I have most of the latest software and I think it is safe to say that this game is the visual benchmark for this genre - hands down.
Finally word - Incredible polish - flawless, gritty, presentation - and perfect 3 monitor support. Believe me - you have not experienced this game until you've played it across three screens.