Manufacturers' Usability Design Specs and UI Labs Apple OS Human Interface Guidelines. Sun Sun's Java Look and Feel Design Guidelines. By Hans de Graaff. HCI Resources on the Web A collection of HCI resources, maintained by Michael Ericsson. A collection of articles that have appeared in WebReview on on topics related to usability.
Usable Web is a guide to resources about Web usability, about making the Web easier to use.
Lots of links to different articles on designing web interfaces.