Motorola Game Development Challenge
/If you have nothing better to do this summer (and who doesn't) you might fancy having a go at the MotoDev game development challenge. You can write your game in Java, or even user C# and managed code to enter in the Windows category. Closing date is in the middle of August.
If you want some ideas about how to get started, you can always have a look at my articles on Smartphone programming with Cheese on MSDN.