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I've noticed that the fan's in the aluminum macbook don't spin up really till about 90C... then hold the temp around 80C (under full stress testing in windows)

Not having one I can't comment. I can, however, say that the operation of the fans under Windows and Mac OS X may well be different -- I'm pretty sure they're different on the pre-unibody MacBooks.

I'd find it kinda strange if the default acceleration curve kept the fans off until 90C -- I can't imagine that's good for the lifespan of the components...
 
I've noticed that the fan's in the aluminum macbook don't spin up really till about 90C... then hold the temp around 80C (under full stress testing in windows)
The fans spin up just shy of 100 C over on OS X and proceed to cool the laptop until it hits ~85 C.
 
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