We just released our new cloud based build system; appHub
This new build system now supports building for iOS, Android, Amazon ( & kindle fire), Nook, Facebook, Chrome Store, Mozilla app store and Intel appUp.
We've made an demo game , "Boom Town" , that has been built and submitted to all these stores using appHub. You can look at the demo and play the game here: http://www.appmobi.com/boomtown
Heres a quick demo video that shows how appHub works: http://www.youtube.com/watch?v=691avpn6wn8&feature=youtu.be