I just got my uMBP 13 a couple of days ago, and today for the first time tried to play some .avi videos I have. I'm using vlc to play them. On my 4 year old Windows XP SP3 laptop they play clearly and sharp without any pixelation or graininess. But on my mac, these same videos pixelate and appear grainy when played. And now that I think about it, the Welcome animation that you see when you turn on your mac for the first time was pixelated and grainy as well. I didn't pay it any attention at the time because I was so excited about finally getting my mac. Is there something wrong with my video card or is it something else?