I came across the following video ("The JavaScript Programming Language") that is a lecture by Douglas Crockford (who is a "JavaScript Architect" at Yahoo!) in which he discusses JavaScript. It is split into four 30-minute parts (totaling 2 hours):
It's useful to download the slides because the video doesn't always show them when he is referring to them.
It is a good introduction to JavaScript, explaining how parts of the language works as well as offering advice on how to use (or not use) various features of it. He also talks some about the history of the language.
Comments
Peter Krumins has pointed me
Peter Krumins has pointed me to one of his blog entries where he lists these videos and even more Javascript video lectures by Douglas Crockford. There is an "advanced" lecture and also a lecture specifically about the DOM. He has even taken notes on the various videos. Also, check out Peter's full list of programming videos.