Looking forward to Forza3 too. The other 2 reasons I have my 360 is Gears of War II and Halo III, but that is mostly because it is the only way to "hang out" with a few old friends I graduated with since we're all busy and have our own lives. I always tell them though, if they were into racing and we added Forza2 in the weekly mix, I would slaughter them. They're not die hard auto enthusiasts though, so this will never happen, haha.
It'd be great to play this with some of you. Gamertag is XeroRed if anyone cares to add.
Gran Turismo may be decent...if it ever comes out.