The Hypermilers (the people into competitive driving for fuel economy) also reccomend turning the engine off at stoplights, or anywhere else you would have to idle for more than a very few seconds. As well as drafting (well not that close, but the same idea) and the coast up to a stop is a big one too (with the engine idling, in neutral or off). Also, try to park where you don't have to back up, they consider reverse wasted motion.
This is all predicated on late model tight clearance (with as light an oil as possible) EFI equipped vehicle though, so with a carb (and larger clearances / heavier oil), I would probably tone down the don't let it warm up, just accellerate slowly while it's cold plan.
I'm not one myself, but I read all this in an article in Popular Mechanics recently IIRC.
I found some more stuff at:
http://www.hypermiling.com/car-mpg.html
