General 

Internet Library of Law and Court Decisions - summaries of court decisions on Web-related issues.

PC Webopædia - searchable online encyclopædia of computer technology.

 Searching 

Comparing Internet search engines - article by Greg R. Notess.

Copernic - simultaneous searching of numerous search engines at one time.

Fagan Finder - search tools and information about searching.

Finding Information on the Internet - tutorial from the University of California, Berkeley.

Hot Sheet - one-stop access to lots of Web search engines, directories etc., on a wide range of subjects.

The Invisible Web Directory - " ... resources that are informative, of high quality, and contain worthy information from reliable information providers that are not visible to general-purpose search engines."

Search IQ - reviews of numerous search engines and meta-search engines.

Search Tools - Information, Guides and News

 Design and usability 

ACIA (Argus Center for Information Architecture) IA Guide - resources on information architecture.

IAwiki - the Information Architect's Wiki (collaborative online discussion space).

InfoDesign Online Resources - links to sources on usability and information architecture.

SearchTools.com: Background Topics: Information Architecture

Ten Good Deeds in Web Design - Jakob Nielson's Alertbox, October 3, 1999, full of good advice.

Usable Web - large collection of links to information about web usability.

 Site creation 

BigNoseBird.Com - tutorials and resources for web site creation.

GrafX Design Web Graphics Tutorials

Metadata

Submit It!: Resource Center - advice on directing search engines to your website.

Unicode Worldwide Character Standard - a platform-independent character coding system designed to support the interchange, processing, and display of the written texts of the diverse languages of the modern world. In addition, it supports classical and historical texts of many written languages.

Yale C/AIM web style guide

 HTML 

Bare Bones Guide to HTML - lists every official HTML tag in general use, plus Netscape and Microsoft extensions.

HTML with Style - tutorials on the use of HTML and CSS (Cascading Style Sheets).

ISO 8859-1 character set overview - including HTML codes for special characters.

Link checkers and HTML validators