I returned my Air today and got a full refund (they felt it was no bueno too). Over the last two days, it began getting slower and slower, the fan would never quit and the heat was incredible. The battery also would only last about ninety minutes. Personally, I think there is something in Leopard that needs to be patched. This started occuring after I installed Fusion and started using a windows XP VM Machine. I dont know if it is related to Fusion or not... I cannot prove it one way or the other since this was also the time I really started to use the Air heavily with multiple apps like Illustrator and Office at the same time. I replaced it with a ThinkPad X61. I really had high hopes for the Air and Leopard. Unfortunately, I think Leopard could actually learn a few things from Vista about reliability and speed. Maybe 10.5.2 will change things.