Temperature switch

[Jabe]

Id like to add fan for my motor, just for safety, so that when it reaches some specific temperature fan goes on to cool motor and preventing it from overheating.
Or i could make it to show its temperature in leds green, yellow and red, red being overheating.
I have found one small circuit to make fan switch, it might be able to use for leds.
http://www.heatsink-guide.com/conten...=control.shtml

Has anyone else found something similiar, perhaps even smaller "device"?