Our friends a Joystiq have just created a video comparison showing differences in gameplay and graphics between Halo 2 and Halo 3 (beta). Sure, there are different weapons, vehicles, and maps, but it wasn't until I saw the side-by-side comparison that I noticed how smooth Halo 3 is. It's only in beta, but I can't wait for Halo 3! Anyways, see for yourself.

http://www.joystiq.com/2007/05/17/halo-2-and-halo-3-comparison-video/

Charles