Looks like the graphics and frame rate are identical. The PS3 might have slightly more colors going on in some of the faces, but you have to look for it.
As for Madden 08, it looks as though the 360 is going @ 60fps vs the PS3's 30fps. I'm curious as to why...I figured the Cell wouldn't have a problem with this? In any case, pwned, I guess. (?)