I just finished viewing the Nikon DVD called “A Hands-on Guide to Creative Lighting”. You can see excerpts of this DVD from Nikon here. You can get it for around $30. (I got mine from West Photo) This DVD features the host, Bob Krist, and Joe McNally.
This is a pretty good DVD, with something in it for everyone. Probably not for the ripest beginner, or the most advanced flasher, because it covers a lot of ground. A beginner or intermediate photographer with a speedlight or two willing to pause, stop, and rewind this DVD a few times will probably get quite a bit out of it.