Have you heard about Reactive (Rx) Framework? If you have been developing for Windows Phone 7, Silverlight or a desktop and had to deal with asynchronous code, the Rx Framework has been a life saver for you. I love it's power and flexibilty. However, the Rx Framework has not been available for Compact Framework 3.5 and WM 5.x devices. But we can make this happen. The LiveLabs team responsible for Rx Framework would be able to release the build for .NET CF if enough people requested for it. You can make them to hear you thoughts in the Rx Fx related forum:

http://social.msdn.microsoft.com/forums/en-us/rx/thread/52276723-EBE1-414F-8295-1C62BAF8B388