Train Hard - Stay Humble
You would-be instructors might be interested in this one as well (x-posted from the PKC blog):
They'll be hanging out and jamming with everyone at UC Berkeley on Saturday afternoon, and then leading a beginner and an intermediate workshop over at Crossfit Marin on Sunday. These guys have been teaching parkour programs longer than almost anyone in the United States so there's a lot to learn from them, and it's only for one day! Be sure to check it out.
Take a look at the threads and event pages below for more info.
Beginner Seminar at Crossfit Marin (Sunday, 11AM)
Intermediate Seminar at Crossfit Marin (Sunday, 1PM)
Saturday jam with APEX