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.