Might I also suggest Jeff Martone's "Tactical Athlete Pull-Up System?
I bought it and loved it. I thought he displayed some amazing feats of strength and since its a video I think some of your questions about from will be answered.
From what I remember he swung his feat a little for momentum. And I also think he started from a dead hang on each rep, but I could be wrong.
Anyhow, I suggest the Martone DVD. Copy and paste the link into your browser.
http://www.dragondoor.com/cgi-bin/prod_list.pl?pauthor=Jeff+Martone