I've just had a few hours at my mates house on his FIFA 09 PS3.
A few points about it:
The "crab-walking" (or moonwalking or through ball bug) was there EVERY match, absolute bollocks. Does my nut in and ruins spells of the game. You can put together a great move, craft the opportunity to play it through, and then your fucking striker turns around and fucking jogs backwards! It happens to defenders as well on chipped through balls, making that tactic too easy.
The full power long ball at goal from kick off results in a goal or very nearly a goal a lot of the time. The keeper walks backwards while the ball is in the air, and sometimes he walks too far back and when he gets the ball he's over the line. It looks funny and made us laugh but it's a terrible bug.
Closing down seems much more effective (too effective) in human v human matches.
The graphics don't seem as polished, and there are slowdowns in a crowded area and on goal kicks sometimes.
The menus are laggy and everything seems to take a long time to load and navigating the menus is slower.
The FIWC Stadium is nice, with the official adboards.
I didn't see any other big differences, but I am of the opinion that the Xbox 360 version is the superior version in the way it plays and performs.