I am the owner of the first revision of the MacBook Air. The last couple of weeks I have been experienced very high CPU temperatures – 102 celsius – PANIC!!!
The MacBok Air generally have temperature issues but I have never seen such high temperatures. I searched the web and hoped to find a solution and yet again the web was to great help. The problem was old thermal grease.

It is quite easy to disassemble a MacBook Air and replace the old CPU thermal paste (http://www.ifixit.com/Teardown/MacBook-Air-Teardown/598/). Remove the old paste with a bit of help acetone, apply the new paste, …
After 15 minutes of work my Air is not running at 102 celsius but ‘only’ 51 celsius.
If you are unhappy with the noise that the MacBook Air makes to keep itself cool try playing with the fan speed (can be dangerous). Read more about it at http://horstr.blogspot.com/2008/04/dont-throw-your-macbook-air-out-just.html
i really have you interesting whit my mac Air. I have’s practice maybe after home .
( ooh for mine , My air is so hot(normally 120F =48c) if i go to youtube video it up to (150F or 170F = 60c or 70c), and i have smcfancontroller but it is making cool down same not a lot and they still really hot .
i hopefully you can make me and my air cool down .
thank you so much