I just got one of the new aluminum Macbooks and everything works great... except when I plugged in some headphones. Whenever audio of any sort starts I get an almost silent static like noise in the background... be it sound from a Youtube video, Ventrillo, iTunes... anything. After a couple minutes the static goes away. But if any sound occurs the static returns. Most of the time you can't notice it because the audio that is playing is louder. But when its silent you can hear the quiet static like noise. I have some Sony In-Ear Earbuds. I tried plugging in the gross default iPod earbuds and I couldn't hear the static with those but that may of just been because I can't fit the damn things in my ears. I don't know if its my Macbook or the headphones just don't like the Macbook.