Burnout Paradise is fun.
I've been playing Too Human(which is AWESOME, f*ck what the reviews say), Madden, and Battlefield: Bad Company.
and I just bought Castle Crashers from XBLA, and it is like a super-cartoonified Streets of Rage. mad side-scrolling beatemup fun.
also, do yourself a favor, and download the SW: Force Unleashed demo from the Marketplace.
What about Soul Caliber IV (or whatever it's called)? Have you played that yet? The demo was nice.