Git Screencast ?

I am a new user of git and SCMs in general , I have learned a lot from the docs , irc and just using it , but there are just some concepts that hare hard to grasp , I am a very visual persion (probably like a lot of you :) ) , is there a screencast of git somewhere (for free) that can demonstrate some of the advanced features of git... (Also...I have seen both Randal (Schwartz) and Linus' (you better know his last name) presentations at google on git , in which they explain the ideas behind git more than the actual usage,

Thanks

---Mike Donaghy----------- ---Mike@mikedonaghy.org--- ---http://mikedonaghy.org-