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Well, seems like everyone else already said what double clutching is.. but really, heel-toe shifting is just double clutching through a turn.
When entering a turn, you have to brake hard, which means you'll have to downshift. During a race, every second counts, so while you're braking, you're using your heel to blip the throttle to maintaince the revs you'll need to be at when you switch into a lower gear.
You're not actually braking and accelerating at the same time, since the clutch is pressed in. (Braking and acclerating at the same time is a technique called left foot braking. Very useful for front wheel drive cars to maximize their turning potential)
While it's true that today's cars have synchronized transmissions that will bring the engine up to speed with the tranny, it's not perfect. Therefore, a car will lurch as the engine tries to catch up to speed. If you've ever felt the lurch, you will realize that it's not something you want to get during a precision turn. Revving your engine to match the gear is the best solution to avoid the problem.
So that's double clutching and heel-toe.
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