purchased my 1.6 HD Air from an apple store last monday and hadn't had any issues till earlier this afternoon, when video playback crapped out (all web video--especially hd--and dvds played through superdrive began freezing/skipping frames, etc) and the fans cranked up to 6200rpm and the hard drive started to make the faintly audible, intermittent clicking noise others have mentioned. two hours on the phone with apple care later, and they determined it to be a faulty video card. as such, the whole machine must now be exchanged at said apple store since the card's soldered and cannot simply be replaced. all this, after a mere six days of use. anyway, I'm fairly disappointed. really do like this machine, just hope this is the first and last major issue I have or it's back to the regular old reliable macbook...