Another point about riding on the clutch pedal rather then throwing it momentarily in neutral to coast.
I have no proof to back this up, but a buddy of mine (the kid with the mini) is the guy who taught me to drive a manual transmission car and he always stressed that you should never leave the clutch in because when you do that, the plates aren't touching, but they are still spinning which could cause them to generate more heat and warp because they are not designed to spin for long without being pressed together. What he said makes sense and I've driven a car with a warped clutch pad and it can be very difficult depending on the degree of warping that has occurred. He also stressed that you should engine brake whenever possible to save your brakes (he is a race car driver where brake wear and heat are a major concern) and like was mentioned here, it also saves fuel if your car has the fuel cutoff system in place when decelerating.
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