A webmaster help site featuring standards-based HTML tutorials, CSS tutorials and other web design help including articles and tutorials about search engine optimization and web design in general. [VisComm Faculty Recommendation]
An umbrella site from Internet.com with links to many large interactive media sites: Webdeveloper.com, WebReference, JustSMIL, StreamingMedia World, JavaScript Source, ScriptSearch, etc.
Noted CSS author, Eric Meyer blogs on subjects such as CSS, Web design, and Web standards, provides a toolbox and links to his books and other writings.
"The World Wide Web Consortium (W3C) develops interoperable technologies (specifications, guidelines, software, and tools) to lead the Web to its full potential." Here you will find links to the standards for HTML, CSS, HTML and CSS Validators, XHTML, XML