The age of not necessarily supporting Netscape 4.xx is beginning to be upon us. I have been getting into some of the cool stuff that has been invented (the standard stuff, not lame or proprietary stuff) since Netscape 4.7 came out.* The current state of this web page is an example of some of the neat things style sheets can do (not a particularly refined example -- I am still learning). These are some style sheet references I use most when I make pages that use them.
(I may attempt to augment this list as I find more links.)