A good write up on one of Rickson's "Invisible Jiu Jitsu" seminars:
http://www.nhbgear.com/forum/index.php/topic,98428.0.html
Click on "Jiu Jitsu Gear Forum," then scroll down to "Rickson Gracie Seminar: Thoughts and Observations."
There's Jiu Jitsu, and then there's Rickson's Jiu Jitsu.
Now you gotta start teaching "Internal Jiu-jitsu" - IJJ
um.... he has for years.
I recently worked with someone who was there. He showed me what Rickson taught. The ground concepts were very sound and enlightening, but some of the standing concepts...were not so sound to me (from a Judoka/sambo player perspective). I would of loved to have been there.