I don't know if anyone here owns an Xbox360 (to complement their Uzebox of course) but I have been totally hooked into a game that I think everyone here can appreciate. It's a 2D breakout-ish game that is available on Xbox Live for the low low price of $3 called Wizorb.
It plays like an 8-bit breakout clone with RPG elements to spice it up. It's not incredibly deep, but its really fun, and certainly challenging. Suffice to say that I've been playing it for 3 days straight...neglecting a lot of other work I should be doing in the process.
Can't recommend it enough!
Check out the trailer, and the website for more info:
http://www.wizorb.com/