This is what a friend of mine told me... he tracks his car and is very knowledgeable:
not quoting but the point was that to let a car idle to warm up is not necessarily good for the car. When you start it up and begin to drive it right away you are getting more oil up into the engine right off the bat. if you let it idle you are not getting as much oil up and this causes friction, friction in an engine is bad (duh).
As to gunning it right off when the engine is cold, I would not recommend it as the oil is heavy and will not lubricate properly at a time of high friction.
So my advice (and I am no mechanic and a novice to the mechanics of engines) do not go to either extreme... idling is bad, and gunning it cold is bad.
My two cents
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