This repo is a fork of http://code.google.com/p/osmdroid/ stripped down to only contain what is necessary to implement a tile overlay on top of google maps.
TODO - the main hook is GoogleTilesOverlay. this overlay takes a tiles provider to overlay on top of google maps.
This repo is currently not in production use yet, so use at your own risk!
Since osmdroid is under the LGPL, this is as well.