I got on an arrowhead buying jag at ebay a few months back, got some nice things, too. tried to knap a little (bought a box of rocks with a copper flaking tool), to no avail...
here's two links for videos, the Bruce Bradley, Ph.D guy is supposed to be pretty good. He worked on a book called "The Fenn Cache", I believe, that has stunning photographs of clovis points from the site the book is named after.