Some palm nailers drive nails with a single powerful stroke, but his particular model uses lots of really short, sharp strokes. This seems to give better control, particularly when toenailing. The model we bought (we actually bought two of them) is made by Porter-Cable and was the highest rated of the brands we could find. It has held up excellently.
The DeWalt compressor is a standard 4-gallon, 2.5 horsepower model and it more than keeps up with the nailer. It's a heavy sucker, though, and I'm getting tired of lugging it back and forth at the beginning and end of each work day.
Addendum: We (just my wife and I) finished the framing all of the interior walls of the house in about three weeks. It was a piece of cake, thanks to these two tools (plus a saw, of course).