The NCAA Football 2007 Demo is now on the Xbox Live Marketplace.
MS has also added new Mass Effect and halo 3.
This is really cool, three great additions in one day. I'm about to head off and download the NCAA demo. I'll let you know what I think about it tomorrow.
Hopefully it's a hell of a lot better than Madden 2006 – which was absolutely abysmal on the 360.