There are quite a few Rhoebus and Fan Controllers out there that will allow you to control your fan speeds. I don't know of any that can do what the Zalman ZM-MFC2 Multi Fan Controller can do. Not only does it provide you with the ability to control your fans, but it can also report your system's temperatures, and how much wattage your system is using. And, it looks nothing like any other unit out there.

http://www.virtual-hideout.net/revie...C2/index.shtml