I wish more people screencast like Notch. He spends most of his time coding, and very little talking to the camera.

Most people who code for the camera thinks it's the 'Me Show!' and act like a starlet.

He also codes from scratch, without practicing beforehand. (At least, not that exact problem.) This means you get to see his thought process and all his trial-and-error. When watching most tutorials, they've got it all planned out beforehand and it doesn't teach you to think, just to copy.