The FEAR 2 demo is actually pretty interesting, as it's a demo for the upcoming single-player DLC pack, "Reborn." It's not very common to see demos for an add-on, but it seems like a pretty good idea. If you're hankering to see what "Reborn" has in store, download the demo and give it a try. The DLC itself was originally scheduled to release this month, so it should be available any day now.
Add the Fight Night Round 4 demo to your Xbox 360 download queue
Add the FEAR 2 demo to your Xbox 360 download queue