Dave Beckett's RDF Resource Guide
   An extensive and annotated collection of links to RDF documents and software, updated frequently.
   http://planetrdf.com/guide/

Hyphen.info
   Repository of RDF hierarchies.
   http://www.hyphen.info/

Introduction to RSS News Feeds
   Find out how to create and use RSS files and learn what they can do for you. See why companies like Netscape, Userland, and Moreover use RSS to distribute and syndicate article summaries and headlines. This article includes sample code that demonstrates e
   http://www-128.ibm.com/developerworks/library/w-rss.html

PML
   Proof Markup Language is used to build OWL documents representing both proofs and proof provenance information.
   http://iw.stanford.edu/2005/wd-pml-primer/pml-primer-20051128.htm

RDF Interest Group
   The main discussion forum for RDF developers and users.
   http://www.w3.org/RDF/Interest/

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/

RDF Resources
   Links to various documentation of RDF sources.
   http://InfoLab.Stanford.EDU/~melnik/rdf/

RDF-DEV : A Site for RDF Developers
   Resources database containing links to guides, papers, tools, and standards in addition to the archives of the (now closed) RDF-DEV mailing list.
   http://www.ilrt.bris.ac.uk/discovery/rdf-dev/

SchemaWeb
   Repository for RDF schemas expressed in the RDFS, OWL, and DAML+OIL schema languages.
   http://www.schemaweb.info/