If you're writing games, you should probably go with a C or C++ based solution with OpenGL es. That can run on all platforms except for Win phone 7 (for now).

If you're writing games, you should probably go with a C or C++ based solution with OpenGL es. That can run on all platforms except for Win phone 7 (for now). For applications there are a couple of iOS/Android solutions such as Appcelerator or Phonegap