The HCI Bibliography project is a reference library website on Human Computer Interaction and User Interface Usability. I came across the website while reading the foreward by Gary Perlman from the book Interaction Design: Beyond Human-computer Interaction by Preece Rogers and Sharp for my Masters HCI subject.
The website is a collection and repository of information on the subject since April 1998 and contains publications, journals, definitions and links by a multitude of authors and writers. It is definetly worthwhile visiting even if you are new to the subject area.
www.hcibib.org