Sure the XBox 360 has been out a year longer than the other two, but the numbers are still interesting:
[Images missing — nexgenwars.com is now defunct —Ed. 2015-08-15]
At first glance, it seems as if game innovation may actually be beating out making old games prettier.
The above graphics are supposedly updated once per minute with the latest sales figures. When I first posted them, they looked like this: