I attended The Flash Bus Tour in Pittsburgh. The room was packed with avid photographers who were eager to learn about flash from the Strobist (David Hobby) and Numnuts (Joe McNally).
In the morning David went over manual flash and how he layers the light on the subjects.
In the afternoon Joe talked about and demonstrated TTL Flash. He even pulled people up on stage and demonstrated how to set up the flashes and take the photos.
I learned a lot of information. I now want to start trying to apply it.
Check out the blog post at http://tjpowell.net/2011/04/the-flash-bus/
for more information.