Chris Fry of MDTS Training has built awesome coursework for this very situation. He has both a two or four hour short block that he teaches at various Tac Cons (he just did it most recently at PeP3, and will very probably be doing it at Rangemaster next year). He also does it as a full day course as well, I know he was teaching it at Triple Aught Design in San Fran a few weeks ago, and regularly runs it in the NE US. I am trying to figure out how to get him out to AZ to do it as well soon.
I think his general take on folders and how to use them, but more importantly, how to TRAIN them, is as good as it gets. Hopefully soon, he will commit some of it to DVD. If you go to his website, he has a number of articles on this subject, as well as reviews of various folders.
http://www.mdtstraining.com/