A wiki with resources for developing web sites, including information on opening links in a new window, creating scrolling text boxes, working with tables, password protecting individual pages, creating rollovers, and more.
Webmaster Resources: free web graphics, HTML and CSS tutorials
BoogieJack.com is primarily a webmaster resource site featuring HTML tutorials, CSS tutorials, web graphics and very cool products you won't find elsewhere.
This is W3C's home page for the HTML Activity. Here you will find pointers to our specifications for HTML/XHTML, guidelines on how to use HTML/XHTML to the best effect, and pointers to related work at W3C.