Background
Dynamic HTML: More Client, Less Server
PC Magazine contributor Neil Randall compares the Microsoft and Netscape implementations of Dynamic HTML.
Dynamic HTML: Wave goodbye to the static Web
ZDNet Whole Web Catalog's IE 4.0 Beta Zone

Reference
Microsoft Site Builder: Dynamic HTML
An overview, white paper, technical reference and more about Microsoft's implementation of Dyanmic HTML.
Dynamic HTML in Netscape Communicator
Documentation on Netscape's implementation of Dynamic HTML, style sheets, dynamic fonts, etc.
Document Object Model
The W3C's effort to create a platform- and language-neutral method for publishing documents with dynamic content, structure and style.
Positioning HTML Elements with Cascading Style Sheets
The W3C working draft on style sheets.
Technical Reports & Publications
W3C technical reports, working drafts, proposals, and other publications, many devoted to advanced HTML.

Tutorials
Dynamic HTML Lab
From Webreference, new articles on Dynamic HTML every two weeks.
Using Dynamic HTML to create an animated navigation bar.
An article from NetscapeWorld, June 1997, showing how to create an animated navigation bar in both Internet Explorer and Navigator.

Software
To view documents using Dynamic HTML, you'll need Netscape Navigator 4.0 (Communicator) Preview Release 3 or better, or Microsoft Internet Explorer 4.0 Platform Preview 1 or better. Note that HTML created for one browser won't necessarily work with the other.
Companies demonstrating Dynamic HTML tools (Microsoft Press Release)
A list of tools supporting Microsoft's flavor of Dynamic HTML.

Demonstrations
Microsoft Dynamic HTML Gallery
Requires Internet Explorer 4.0 to view.
Netscape Communicator Demonstrations
Requires Netscape Navigator 4.0 (Communicator) to view.
Taboca ETC
Demonstrations of Netscape's implementation of layers and JavaScript, along with documentation.

More Links
Dynamic HTML Index
A well-organized list of pointers to other resources.
Yahoo! HTML Sites
Yahoo!'s category on HTML includes dynamic HTML links.