SIGCHI

ACM Special Interest Group on Computer-Human Interaction

An Indexed Collection on Human-Computer Interaction Maintained by Keith Instone

Wonderful Collection of Links about Information, Architecture, Human Factors, User Interface Issues, and Usable Design Specific to the World Wide Web.

Article on the Value of Usability to a Business by Aaron Marcus

Jakob Nielsen's Website on Usability

Web Content Accessibility Guidelines Maintained at W3C

Excellent Usability Toolkit Consisting of a Collection of Forms, Checklists and other Useful Documents for Conducting Usability Tests and User Interviews Maintained by the Usability and User Experience Community of the Society for Technical Communication.

Usability Toolkit at Gerry Gaffney's Information and Design Website