Virtual-Hideout has a review of Innovatek’s Fan-O-Matic Micro, a fairly advanced Fan Controller.  Instead of guesstimating the RPM’s you want in order to balance noise an temperature, you set the desired temperature, and it manages the RPM’s.
“Innovatek has built a strong product that many people should find useful for either water cooled systems or air cooling. It does everything for you, the only adjustments you make are to the manual temperature knob. ”

Here are some more Cases & Cooling reviews from around the web:

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