I can be listening to iTunes, with Mail.app, Firefox, and Transmission running in OS X, with Fusion running XP (in another Space) where I RDP into servers at work over a VPN connection and still not hear my Air's fans. iStat shows them running between 2500 and 4000.
IMO, you're being dramatic if you're trying to say that an Air's CPU has to run idle in order for it to be considered whisper quiet and to prevent the fans from running at 6000+rpm.
You gave two extreme examples -- the CPU not being used (when reading a page in Safari) and the CPU being pegged (when using Flash or watching an HD trailer).
In the real world, there's a whole gamut of things you can do on an Air that results in CPU usage between your two examples that don't cause the fans to run at an audible level.
Fixed your quote for you.
Maybe you have the ssd version?? Not with the 2 mba with 1.6/80 that I had which went up to 6000rpm not to mention the fan is very annoying high pitched brrzzz sound.
I opened up ichat, mail, itunes, microsoft word (new ub version) 4+ safari (with no flash), 1 youtube video (non fullscreen so ok 1 flash, but my macbook even first gen can open a flash or even up to 10 without the fan going up to 6000rpm instead around 3500rpm and no high pitched brzzz noise instead of a gentle woooosh sound thats barely audible) and the mba was around 5500-6050rpm.
It starts up slowly and you can hear the little fan working which I thought should have used bigger fans so it wont make that annoying reeeeeeeeeeaaaaaaaarrrrrrrrrrrr type of noise that starts up that eventually becomes brrrrrrzzzzzzzzzzzzz and takes forever for the fan to die down (around 10-15 minutes after you close almost ever program or for me I just closed the lid let it sleep and just wake it back up then its instant quietness again).
Especially when your in a room with no tv or music on that becomes the center of your attention. I really tried to love the mba but the heat/noise was just way too much.
Not to mention that even my core duo 1.83Ghz first gen macbook is much faster than the mba with playing 9 youtube videos (non full screen), 1 hd trailer at 720p, 20+ safari, 10+ firefox, ichat, mail, visual hub converting somewhat 4gb file to mp4, colloquy, azureus,itunes, microsoft word and the fan noise was just barely audible around 4000-4500rpm and didnt see a slow down whatsoever. Just for something that you pay almost 2k for runs that much slower + to add to the cpu being maxed out so easily and have to pretty much watch what you run so the fan doesnt rev up to 6000rpm.
Pretty much I can throw anything at my 1.83Ghz first gen core duo macbook and 95% of the time the fan is barely audible at 2000-4500rpm (maybe bigger fans?) while running about the same type of heat as the mba + no slowdowns or color wheels popping up.
I think the only reason that apple hasnt added the same led screen that the macbook air uses to the current macbooks is because that would drive so much sale away from the mba to the macbooks. I cant wait for the next revision of the mba + the macbooks (which I hear will go aluminum and shave off some pounds + led screen).
I have a feeling that since the next revision of the macbooks will be so awesome that the newer mba will have even better/more features to differentiate the sales between the newer macbooks with 2.5" hdd's + led + shave off a couple of pounds... maybe the newer mba's will add fw800, 45nm, 4gb RAM and alot of ?? to the next mba revision.
Also I wouldnt be surprised if the mba's get updated later this year and the prototypes (current mba's are done with) since usually first rev. a's to rev. b's are updated earlier than later rev. c's to d's and etc.