Mozilla Developer Center – MDC; Building an Extension; Core JavaScript 1.5 Guide; Core JavaScript 1.5 Reference
Firefox Addons and What’s new in Firefox 1.5 (changelog)
XMLHttpRequest at XULPlanet
David Baron’s Weblog and his Fragmentation of document formats on the World Wide Web
Burning Chrome: WeirdAl’s blog at MozillaZine (Alex Vincent)
Architecture of the World Wide Web, Volume One: “W3C Recommendation 15 December 2004”
XML Binding Language 2.0: “Work in Progress — Last Update 6 December 2005”
Position Paper for the W3C Workshop on Web Applications and Compound Documents
Minutes: W3C Technical Plenary 3 March 2004
mailing list for technical discussion of WHAT Working Group specifications
And just for the pleasure of it: Natural Docs: “an open-source, extensible, multi-language documentation generator. You document your code in a natural syntax that reads like plain English. Natural Docs then scans your code and builds high-quality HTML documentation from it.”