For those who missed this link or haven't heard of it, it's a good guide for controling fan speed of & overclocking the video cards. I just lowered my stock 8800GT's idle temp from 60ish to 53'c with the fan running at 45% (the sweet spot without the annoying/whining noise).
If you just want to control the fan speed, read all but the last sections.
Configuring RivaTuner Creating Fan Profiles Creating Launcher Items Configuring Automatic Fan Control Creating Overclocking Profiles
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