Dynamic Drive
An impressive collection of free DHTML scripts to use on your web site. Most of the scripts will work with both version 4 browsers, and the selection of useful scripts is excellent.

Dynamic HTML Lab
A set of tutorials and DHTML tips from Webreference.com. A good place to learn some dhtml tricks.

The DHTML Sites Chart
A listing of the top DHTML sites as determined by viewer input (giving each site a rating). This will help you find out which sites are the most popular with the viewers.

MSDN Online Web Workshop
A section on the Microsoft web site that includes articles, information, and links on DHTML for IE 4. Also has informtion on CSS and HTML.