Other than Forza 2? Forza 2 is great and all, but I'd like some more interesting driving - maybe rallying or something. I tried PGR4 and it was HORRIBLE. Really weird handling, no force-feedback, etc.
Not sure how well it would work out, but Need for speed Undercover may be pretty good. I loved the game with a standard controller... Online isn't great though, and there's no split screen racing either. Just rent it though, I beat the game in about 15 total hours (All the races, not just the story mode)
I tried NFS at a mates house. It's not particularly good with the wheel. I've heard SEGA Rally is good :/ I might get that..