A month or two ago I submitted a tutorial to Ray Wenderlich on how to create a cross-platform game using Corona SDK. Because of the iOS madness that was going on at the time, the publish date got pushed around a bit, but has now debuted.
Check out the full tutorial at www.RayWenderlich.com
I take you through step-by-step from how to install Corona SDK to creating a finished game that will run on any support Android and iOS device. Hope you enjoy it!