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Dimensions – A walk thru mathematics (www.dimensions-math.org)
A film for a wide audience! (I've shown parts to second graders, but it's not child's play, some of it can get complex, literally, from the complex numbers chapters and beyond.)
Nine chapters, two hours of math, that take you gradually up to the fourth dimension. You can download two quality versions or watch it online.
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Also, a very long feature column about their work, that appears to be written well before the movie Dimensions was released, is on the American Mathematics Society (AMS) website at http://www.ams.org/featurecolumn/archive/lorenz.html