The F.E.A.R. demo is finally on Xbox Live.
It's a very short demo but it gives a very good feel of what to expect in the full game. I'd recommend checking it out, for what it's worth; I think this is going to be the best first person shooter on the 360 for a little while.
My only gripe is that the controls don't really feel all the way there. I found it hard to aim.
I'd recommend that everybody reading this make a point to download F.E.A.R. on the marketplace as soon as possible, it's a jolly good, frightening, first person shooter.