W3.org:

W3.org has 287 URLs listed in 163 Dmoz categories.

Weaving the Web
The original design and ultimate destiny of the World Wide Web, by its inventor, Tim Berners-Lee. Features a linked glossary, a time line, errata and an excerpt from Chapter 1.
http://www.w3.org/People/Berners-Lee/Weaving/
Top/Reference/Knowledge_Management/Knowledge_Representation/Semantic_Web

Semantic Web Roadmap
An attempt to give a high-level plan of the architecture by Tim Berners-Lee.
http://www.w3.org/DesignIssues/Semantic.html
Top/Reference/Knowledge_Management/Knowledge_Representation/Semantic_Web

cwm
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.w3.org/2000/10/swap/doc/cwm.html
Top/Reference/Knowledge_Management/Knowledge_Representation/Semantic_Web

PICS, Censorship, and Intellectual Freedom FAQ
Examines intellectual freedom issues raised by the Platform for Internet Content Selection (PICS), a set of technical specifications developed by the World Wide Web Consortium (W3C), and often used in filtering software.
http://www.w3.org/PICS/PICS-FAQ-980126.html
Top/Reference/Libraries/Library_and_Information_Science/Intellectual_Freedom

Resource Description Framework
Official pages from the World Wide Web Consortium, includes the specification, resources and news, and a links collection.
http://www.w3.org/RDF/
Top/Reference/Libraries/Library_and_Information_Science/Technical_Services/Cataloguing/Metadata/RDF

RDF Logic Mailing List
Provides a forum for technical discussion concerning the design of logic-based languages for use on the Web.
http://lists.w3.org/Archives/Public/www-rdf-logic/
Top/Reference/Libraries/Library_and_Information_Science/Technical_Services/Cataloguing/Metadata/RDF

SPARQL
This specification defines the syntax and semantics of the SPARQL query language for RDF.
http://www.w3.org/TR/rdf-sparql-query/
Top/Reference/Libraries/Library_and_Information_Science/Technical_Services/Cataloguing/Metadata/RDF

Describing and retrieving photos using RDF and HTTP
A project for describing and retrieving photos. It describes the RDF schemas, a data-entry program for quickly entering metadata for large numbers of photos, a way to serve the photos and the metadata over HTTP, and some suggestions for search methods to
http://www.w3.org/TR/photo-rdf/
Top/Reference/Libraries/Library_and_Information_Science/Technical_Services/Cataloguing/Metadata/RDF/Applications