video casting
I think that has great potential for very, very short (certainly no more than 1 minutes or so) library tutorials.
The problem with Utube is quality. There is so much crap out there, that I don't have the time - or the inclination - to go through the stuff that comes up. Computers in Libraries gave their first library "tubies" awards last spring.
Here's a link to the links with the award winning videos.
http://arlib.org/pipermail/arklib-l_arlib.org/2007-May/000151.html