So let's get real about this. I was sorting out the accounting for my business this evening and working out how much VAT I can claim back and figured I would do some testing as well to keep myself awake. I am holding the MBA on my laptop Start: CPU is idling. I have Chrome running with 4 tabs, Finder, PathFinder, Desktop Monitor and I've put on a SD episode of Family Guy. Chrome is downloading the latest Xcode and IOS Beta. Note that I've muted the sound so that I can hear the fan. Fan is inaudible at tis point, unless you put your ear by the enclosure in a silent room. So what'a happening 4 minutes later? Everything is fine. MBA feels cool to the touch, but the CPU temp has risen. Fan is still inaudible. Everything is still fine 8 minutes after the last screenshot and the fans remain at the same point. The CPU temp has risen slightly, but there is no noticeable heat from the keyboard or to my lap. Ok, I am getting bored now so I've opened Mail, Itunes is playing music, Word and Excel is running and I still have VLC playing the Family Guy episode in the background.