Free online classified ads and job posting at Astanda.com
http://www.w3.org/TR/WAI-WEBCONTENT/
From the World Wide Web Consortium. These guidelines are the closest you can get to official usability standards.
http://www.worldcat.org/
Global catalog finds more than one billion items and growing, online articles and files as well as books and media in libraries near the searchers computer location.
http://www.clir.org/
Identifies and works on critical issues that affect the welfare and prospects of libraries and archives. Offers publications, summaries of project activity and fellowship information.
http://www.dialog.com/
Providing online-based information services to organizations in such fields as business, science, engineering, finance and law.
http://www.stumbleupon.com/
Free web-browser extension which acts as an intelligent browsing tool for discovering and sharing web sites; recommendation engine is based on explicit interests survey and feedback via site ratings. Features screen shots, toolbar guide and contact information.
http://www.tomoye.com/
Software and consulting services to leverage know-how and expertise by connecting peers in high-value online networks that let them share and find knowledge, locate experts and have conversations. Features product, services and contact information.
http://www.useit.com
Jakob Nielsens column on Web usability, usability engineering, and his minimalist approach to Web quality, recommended links/books. Also his biography and upcoming talks.
http://www.w3.org/2001/Annotea/
Live early adoption and demonstration project enhancing the W3C collaboration environment with shared annotations.
http://www.boxesandarrows.com/
Journal dedicated to discussing, improving and promoting the work of the information architecture community. Offers current, as well as previous issues and submission information for authors.
http://www.w3.org/DesignIssues/CG.html
Comparison of Conceptual Graphs as a logic layer to RDF.
http://contentology-blog.blogspot.com/
A resource site with information, links and analysis on information design and architecture, usability principles, Web design, content development and Internet news. Produced by contentologist G. A. Buchholz.
http://www.w3.org/2000/10/swap/doc/cwm.html
A general purpose data processor written in Python. Core language is RDF, extended to include rules, using RDF/XML or RDF/N3 serializations as required.
http://www.ewenger.com/
Homepage of the Community of Practice researcher and consultant who coined the term along with Jean Lave. Features links to his widely-read publications on the field, including an exhaustive survey of technologies that can be used to support Communities of Practice.
http://www.agfa.com/w3c/euler/
A backward-chaining reasoner based on RDF and OWL, using resolution inference mechanism and following Euler paths.
http://www.eurocris.org/
Non-profit association of individuals and organizations in the European current research information systems (CRIS) community. Features information about technology, events, publications and membership information.