[Inquisitor]

Forza has indeed gotten stellar reviews.

I still enjoy Burnout 3 on the xbox. Fantastically executed online and offline modes.

Need for Speed underground was good, not sure about NFSU2.

The Colin Mcrae (sp?) games ave all been solid racing games. I believe 4 is a budget title, 20 bucks.

The Corvette game was supposedly actually VERY good, albeit it short with no damage physics, but good nonetheless.

[Roberto88h]

Any of the Burnout series are awesome (burnout 3 is by far the best though)
Need for Speed underground 2 is cool and so is Midnight club 2 and 3 if you like games where you customize like crazy.
Rallisport 2 is currently my favorite racing game (that I own)
I've also heard rave reviews about Forza motor sport
For an arcade-ish racer, midtown madness 3 is king.