The quadrotors in those demos (there are a bunch of good ones I've seen) are acting autonomously. They're given a goal ("go through that window!") and they "figure out" how to accomplish it. Take a look at this one: http://www.youtube.com/watch?v=3CR5y8qZf0Y .
The part 2 and 3 videos from this same group are also very impressive. Part 2 is extra impressive to me because they do a dynamic demo--instead of objects in fixed positions, they toss a hula hoop vertically and the quadrotor darts through it as the hoop is moving. Cool.
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