Man, sometimes it's easy to forget how far graphics have come in such a short time, so here's a little reminder.
The Prey we could have gotten back in the 90's: http://www.gamespot.com/pc/action/prey/video_player.html?id=IiA2ljr_5b4KuTM
Prey now: http://www.youtube.com/watch?v=GXCfgfSUuEI&search=prey
Ok, a lot of time has passed there, but how about how much graphics advanced just last generation!
Splinter Cell 1 (Xbox): http://screenshots.teamxbox.com/screen/7043/Tom-Clancys-Splinter-Cell/
Splinter Cell Chaos Theory (Xbox): http://screenshots.teamxbox.com/screen/34206/Tom-Clancys-Splinter-Cell-Chaos-Theory/
Halo: http://screenshots.teamxbox.com/screen/17313/Halo/
Halo 2: http://screenshots.teamxbox.com/screen/31090/Halo-2/