Javascript

My enthusiasm for javascript waxes and wanes with the tides. Currently, it's been reinvigorated by some of the stuff Google has been doing and the possibilities for lightweight, distributed web applications (and I don't mean AJAX). An example: the moshi 95 widget

Frameworks and Libraries

Prototype
Dojo Tool Kit
script.aculo.us
Yahoo! User Interface
top 10 js functions (dustindiaz.com)

Tools and Utilities

JPSpan (sourceforge.net)

Reference

MDC Javascript Reference (mozilla.org)
MDC DOM Reference (mozilla.org)
long list of js libraries (edevil.wordpress.com)

Topical

Import XML File (quirksmode.org)
windows.onload (again) (dean.edwards.name)

Common DOM Syntax

var element = document.getElementById(id);
element.innerHTML = markup;