Charlie has recently released a ten video collection on his 9 square poi theory.
Teaching this theory at WildFire prompted him to place these ideas onto youtube for all of us to enjoy!
Every one of the lessons is well thought out and has real world references to describe the motions and behaviors of poi spinning. An excellently worded set of lessons, eeven the most experienced spinner will be sure to gain knowledge from these videos.

The intro video is here, http://www.youtube.com/watch?v=J_jpE31_9DE

And this video is the first lesson.