Hey all, I wasn't sure if this has been mentioned yet on here, but Microsoft has another competition that started Dec, 20th, but doesn't end until Feb 28th. There are some prizes, including a trip to the Studios in Redmond to meet with the Microsoft Studios team. Other prizes include games and Xboxes.
I have been up to the Studio buildings many times during my years at Microsoft and the group up there is pretty great. Though the competition says they are looking for Windows Store and Windows Phone apps, the fact that all the prizes are gaming related leads me to beleive that they are thinking of games mainly.
If you want more info check it out here: generationapp.com/ultimateexperience
Also the more apps you submit to the Windows or Windows Phone store, the more chances you have to win.