Note that you may have seen this before under a simpler, shorter name, but I had to change it a bit, as the short version is apparently trademarked. Who knew?
Source code is available at: http://code.google.com/p/greenscreenpong/
Recently changed in this version:
* save high scores!
* bug fix in tilt-calibration
* Tapping the screen now restarts the game when it's over.
* Pausing, resuming, or restarting the game now recalibrates the tilt.