A really simple example of style sheets
World's fastest and shortest introduction to style sheets
A bit more explanation about style sheets
HTML 4
Jeff Williamson
Northern Virginia Community College
www.nvcc.edu/home/nvwillj/html4/
Path animations
Dreamweaver has an interesting timeline feature that allows you to define a path for an HTML 4 layer and run it around the screen. The result is a moving static image which isn't that compelling to me right now but then maybe I just haven't thought of it the right way.
Click here for an example of HTML 4 path animations created with Dreamweaver (required 4-level browser)
Don't try this one without Dreamweaver - the code is incomprehensible.
However Jamie Jaworski has a nice lower-key float animation in one of his SuperScripter columns - looks do-able.