The other day I downloaded two great games from XBOX live. The atmosphere and creativity of Limbo was amazing. I also loved the fact that it has some seriously creepy moments. Limbo is about a boy's quest to find his sister. The other game I really enjoyed was Rocket Knight A wonderful remake of the SEGA Genesis classic. Colorful side scrolling platforming goodness. I put links below for those who enjoy good console platformers.
Rocket Knight actually isn't a remake, but a sequel. While that game does have its weaker parts (like the music, which isn't nearly as catchy as in the originals) it's one of the most satisfying platformers I've played this year. Definitely worth multiple playthroughs.