Nice idea, Aardil! There are some really neat ideas here, but I think that there are going to be two classes of response.
First group of people will want to do it themselves. There are other designs that are better in some ways. For instance, does your design turn the fan full on and full off when it reaches the highpoint temperature? How much hysteresis does it have (we don't want the fan turning on and off constantly as it hovers around the setpoint)? Does it use PWM to allow very low fan speeds and high efficiency or does it use linear regulation that is smoother but puts out more waste heat?
The second group is probably smaller. They find the idea neat and want to get one because they don't have the time and/or expertise to do it themselves. Truthfully, you have a good price for what you are offering, I believe.
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