AVGA: The AVR-based video game platform

Two other links you might like:

- http://www.rickard.gunee.com/projects/video/pic/gamesys.php (tetris and pong on a pic 16f84)

- http://www.quinapalus.com/picsi.html (space invaders with just a 16f628).

They both use a single microcontroller also for sending the video signal (like the submitted project).