World Wide Web Consortium The group that makes the Web possible by developing standards and tools. Is your code valid? Check here. Include lots of topics besides html.
Webmonkey Lots of useful tutorials and cheatsheets.
Accessibility
Section 508 Web Portal The Center for Information Technology Accommodation (CITA), in the U.S. General Services Administration's Office of Governmentwide Policy. Section 508 is the law requiring that Federal agencies' electronic and information technology is accessible to people with disabilities. This has many implications for federally funded Web sites.
How the web works Discussion from a company that makes web log analyzers.
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