AFAIK the SAT gets the paddles on the wheel, the leather wrapped main shifter, and a slightly different shape to the main shifter. You can see some pictures and discussion here:
http://www.bimmerfest.com/forums/sho...d.php?t=532375
As for any functional difference, it's unclear. Some believe the SAT package shifts quicker (would probably just be a software tweak). It's unclear if this is real or not, and if it is real, if this is quicker in some functionally better way, or just quicker to intentionally be more abruptly-sportier vs smoother.