Computer Controlled Fan Controllers?

[sniperchang]

Is there any products out there that is used to control fan speeds but that is interfaced with the computer and software instaid of using a front panel?

If not I'm making one

 

[diduknowthat]

Yes sir there is one.

http://www.velocityreviews.com/reviews/Sunbeam-Theta-USB-Fan-controller.php

 

[sniperchang]

Looks like they did pretty much I had planned to design.

I wonder why these controller aren't very popular?