Yahoo! Video: Advanced JavaScript Part I, Part II, Part III. A lecture by Douglas Crockford.
IEBlog: Jscript Inefficiencies Part I, Part II, Part III.
Rick Strahl: "FireBug 1.0 Beta Rocks". FireBug is a JavaScript debugger with some remarkable features.
Rick again: "HREF links and javascript : Navigation".
Jason Diamond: "Not Delegates".
Jim Ley: "JavaScript Closures".
Sergio Pereira: Quick Guide To Somewhat Advanced JavaScript.
Pathfinder: JsUnit – Agile AJAX Development
Mike West: Scope In JavaScript
Some things to check for JavaScript analysis.