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Hypercompe scribonia
Big black fuzzy caterpillar, similar to what we called a "wooly worm" growing up, but this one doesn't have a brown stripe like the ones we played with as a kid. It has thin red stripes on its body and he is about the size of a silver dollar when he's curled up like this.
Now I just wish I could see him after his transformation. Looks like a pretty cool moth.
Nice photo! I agree with Aaron's suggestion. Here is the Bugguide.net page for this species: http://bugguide.net/node/view/493