That's right folks.......................the GRAW 2 MP demo is on the Marketplace as of today! It's 16 players online on a map called Outpost, and noting that it's supposed to be, and is, way better than the single-player demo (which is also out on XBLM), you should pwning noobs by now!
Oh and if GRAW doesn't suit your style, a demo for MLB 2K7 is also out today on the Marketplace!
Enjoy!