I found this video today, and it does an amazing job of explaining the public plan, and knocking down some of the sillier counter-arguments against it. It might be a bit remedial to some of the experts here, but it's a great video to forward to others.
I've been fascinated for a long time about using graphics and animations to describe complicated concepts, and health reform is definitely one of the most complex. Use the comments to share other good visual resources you've found.