Thanks guys, I appreciate all the info. I reckon I'll be grabbing a 5870 within the next few weeks - can't wait!
If the games work with TH2go, then I would think they would also work with Eyefinity. The only one I've really had some serious problems with is GTL - the copy protection system that installs with the DVD takes Windows 7 to it's knees, and required a complete reinstall (not an Eyefinity problem). RBR requires Camhack and some fiddling, and some of the replay cut-scenes still don't show in their proper aspect ratio, but ...
http://www.youtube.com/watch?v=aBD9Pan-Vc4
Mate, you are absolutely flying there! Nice driving!