If you are interested in developing Android apps but wish you could use .NET to fulfill this task – soon it will become possible because of MonoDroid project.
Although still in beta/preview phase, but going forward fast. I tried the latest preview release and it works like a charm With integrated Android simulator you can create and debug apps even without having an Android device. Debugging is possible from inside Visual Studio 2010 – the framework nicely integrates with the IDE. Installation is very quick and simple so I encourage you to take a closer look.