What are your favorite demos that you have downloaded from the Xbox 360 marketplace?

I love the Battlefield 2: Modern Combat demo. Lets you play online with 24 players for 2 rounds. Another is Crackdown which is great with co-op over Live for an hour. Also the demo for Dead Rising is a blast.

Gotta agree with Crackdown. I know I haven't been keeping up with my previews and video game magazines, but I heard of Crackdown through the Halo 3 online beta testing, and so I downloaded it. I didn't get to play it all to much, but its hilarious getting your strength up hella high, and kicking the crap outta people. That and throwing tanker cars at them, never gets old.

Fight Night Round 3: I keep coming back to that download even though its hella old.

Rainbow Six: both the online demo and the single player

Rockstars Table Top Tennis: Fun while I played it, too bad it expired

I can't seem to find the online demo of Rainbow Six: Vegas.

Also I downloaded Perfect Dark Zero's demo, which amazingly has online play, co-op play, and singleplyer missions, but I'm not gunna lie, the game is horrible (not the demo, the game in general, at least from what I saw in the demo).

The SAINTS ROW demo give's you a surprisingly large amount of stuff to do. The Pro Evo 7 demo is decent too with full lenght matches and the choice of four different teams.

Yeah Crackdown was awesomely fun aswell as Saints Row, Dead Rising (although u can only play for about 30 mins) and Phantasy Star Universe Beta WAS amazing altho for obvious reasons it expired lol. Still i played it solidly for a couple of weeks