If you don’t know javascript, or you like learning by watching people do things, you might like the “Mootools for the Rest of Us” series over at beautyindesign.com.

It’s not as complete at my Mootools Primer/Tutorial but it is pretty friendly. You get to watch a screencast of someone setting up a document with Mootools and then implementing a few effects like Drag, Resize, Opacity, as well as an Ajax example.