erm... i know u CAN get a molex connector with an inbuilt rheostat... just a variable resistor on the power line basically... that would be your best bet.
see em here, second from the top:
<A HREF="http://www.pcca.com.au/fans.html" target="_new">http://www.pcca.com.au/fans.html</A>
its either that, a do it yourself job, or a new fan (you can get temp dependent ones too!)
Religious wars are 2 groups of people fighting over who has the best imaginary friend.