Screencast Tutorials

I have been talking about OpenGL tutorials for some time, but I haven't gotten around to them. Recently I've been spending a lot of time with Core Audio, and time permitting, I'm going to do screencasts about it too. University is keeping me busy, but I hope to have the first screencast posted around Christmas. I plan to use GLUT to start, and I might move on to Cocoa from there, but I don't want to complicate things from the outset.