I have had 3 MBAs and ALL have had the issue of over heating. Videos stutter and tasks such as closing a program or moving the mouse cursor across the screen even lag. I read people saying elevate it or leave the back of the laptop off the edge of the table to get better ventilation......COME ON PEOPLE WE ARE PAYING £1200 WHY SHOULD WE NOT BE ABLE TO USE IT LIKE A £299 LAPTOP. I read on the apple forums that someone tried running the exact same youtube videos for 2 hours using osx leopard and after 20 mins or so it started stuttering and frame rate dropped, something i have experienced a lot. Here is the thing, they installed XP using bootcamp and the EXACT SAME VIDEOS ran for 2 HOURS WITHOUT ANY PROBLEMS WHAT SO EVER. Surely if this is true that means that OSX is the culprit and not the hardware, which gives hope that a firmware update can fix our problems. I was hoping someone has installed XP that can try this out. That can leave a movie running, then go onto youtube and run 30 mins worth of movies on OSX and then on the XP partition and see if it indeed does run much better on XP. Has anyone here got XP installed to see if the stuttering of videos occurs on XP also??? This would really help in determining if the problem is software or hardware based, meaning we can decide if to refund and wait a couple of months or wait for a firmware update. I just hope apple do not ignore this problem.