Ok, so I bought a rev B back in Nov 2008 and it had been acting weird since purchasing it. Within 3 days I had it in for repair due to the heat issues and odd behavior and it came back a few days later with a note saying all was well and there was no issues and its temperatures were within spec. Anyway, like a schmuck I lived with it until the dodgy keyboard broke and again asked them to check the heat as the fans were constantly on and erratic behavior. So last week I got the laptop back again and was told it was all fine and to apples listed specs. So tonight I finally got the balls to take it apart and reapply the thermal paste. I was amazed to see just how much paste was on the chip ..... it was LOTS. In-fact it was everywhere and spilling over the side. (I will try and upload pics soon). HOWEVER, since carefully cleaning the paste off and reapplying new thermal paste I must say it does work allot better (in a much different way) I still get peak heat spikes at 80C+ in extreme cases, but it doesnt stay like that for long periods of time, as it did when the old fat paste was on it. But the most noticeable change is the lack of crazy full throttle fans on constantly. And this means the battery should last a lot longer. SO what I wanted to say is this, if you do have an issue with your rev B MBA. And like myself couldn't get any luck with apple care, then have a think about maybe changing the paste yourself as it has so far appears to have done wonders for me.