Javascript Nuggets of Goodness
It appears I have't posted anything in far too long. In light of any real content of my own, I'll link to some I think you should look at:
Over at Yahoo Developer Network Theatre, they've put up a variety of video lectures on everything Javascripty. Obviously there's a distinct bias to the YUI library, but some of the talks are rather good. I'd recommend them to anybody who's got an interest in taking JS beyond the basics and isn't sure where to start. The talks by Douglas Crockford (The JavaScript Programming Langauge, Advanced Javascript and The Dom: An inconvenient API) are well worth the watch, they contain one of the clearest explanations of the concept of Closure in JS I've yet seen, as well as discussion of various techniques and tricks of utility in larger JS-based apps.