I'm sure all Air users are familiar with this, I've seen this complaint many times on message boards. MBA's left hand rest gets really warm after some time of continuous use. Uncomfortably so. I found that the way to "fix" this is to just switch the AirPort off. Left hand rest cools down within a minute of having Airport switched off. Now of course this is not much of a fix if you need wireless internet or file sharing, but it can come very handy if you don't need it, as the hand rest will heat up even if the wireless connection is completely inactive, as long as the Airport is enabled. I wish there was some app that would switch it off automatically after a period of inactivity, but for now, you have to switch it off manually (by going to the little wireless menu icon on the menu bar and selecting "Turn AirPort Off") I tried search for this tip on the forum but couldn't find it, hopefully I'm not just restating something that's already well known. Heating in general seems to be an issue with MBA. It's weird that even when my CPU temperature is around 50 all the time, and all other temperatures are below that, the fan just goes to 6200RPM after a while, and it takes it forever to go down (usually if I just stop doing anything other than reading text document for a while, for example) This happens with CoolBook installed, and all voltages set to just 0.9V btw. The machine still won't stop amping that fan, which even at 6200 doesn't really seem capable of cooling it down :\ I actually wish SMCfancontrol would allow me to limit the top speed of the fan - why should it ever go to 6200 when the CPU temperature never goes above 55, and when it seems 4000 RPM does as good (or bad) job cooling it down as 6200 does?