Should we try to do classes again? If you weren't here when we did the classes before, check the intro sticky, as most have been copied up there (hopefully all of them, actually).
You just volunteer with a topic/technique you want to teach, you'll get assigned a week to lead your class and everyone that wants to can follow along.
Let me know if you want to see this again, and if you're interested in leading a class. You don't have to have a topic just now, but if you do, feel free to share that too.