When developing for Android 3.x what resolutions do we set it to
Typically, it's not that straightforward... Android has its own scaling solution for display
http://developer.android.com/guide/practices/screens_support.html Not sure how that's going to deal with AppGameKit, as there is a good chance that depending on your exact resolution and virtual resolution settings, AppGameKit will scale your game, and then Android will rescale it.
However, it seems that most current Android phones run at 480x800, with some newer models supporting 480x854.
Tablet devices can go way higher such as the RIM PlayBook which operates at 1024x600.
I suspect we'll need some clarification from TGC as to how the player app detects the resolution (as defined by in the link above).