You a Halo-fan? Probably not, because if you were you'd probably be on Xbox Live, downloading the Defiant Map Pack that was just released for Halo: Reach - three new multiplayer levels for 800 points.
"But I am not a Halo-fan because I've never played Halo: Reach!" you lament. "And I am stuck in outback, 100 miles from the closest game store!" Luckily for you, Halo: Reach is now available on Games on Demand as well, so you can always pick it up for download instead of buying it on a physical disc. Of course you'll probably be able to find it cheaper if you actually make the drive, but there you go.