Last weekend, I attended a gamejam in my hometown Aalborg, Denmark, called Indie9000. It was a 48 hour challenge. The theme which we had to fit our game in was:
http://en.wikipedia.org/wiki/Carnival_in_Denmark (Fastelavn). At the event a guy who had released a game on XBOX had a small pitch-talk where he talked about how to release games for XBOX.
After the 48 hours, it was time for the award "ceremony", we competed in the following categories: "Best graphics" "Best sound/music" "Best technics" and "Best game". Our game was nominated in all categories, and we won "Best sound/music" and "Best game"!!!!
You can find our game here:
http://www.madsdj.dk/ It's the one called "Tønde Tærsk" - it's only in danish, but you'll probably figure it out.