Being a fan of the Sega Genesis, and while probably common knowledge to most fans, I've heard for awhile it could do more than 64 colors. So I decided to play a few games, see how many colors were being displayed. I put up the results, if anybody was interested:
http://www.youtube.com/watch?v=Z9rjwECf2wQ
http://www.youtube.com/watch?v=Z9rjwECf2wQ&fmt=22 (720p)
http://www.youtube.com/watch?v=Z9rjwECf2wQ&fmt=37 (1080p)

