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Semantic Web on wikipedia
Semantic Web group on Drupal.org
W3C Semantic Web Activity
RDF/XML Syntax Specification
RDF Primer
SPARQL Query Language for RDF
Introduction to Semantic Web (tutorial)
Semantic Web Tutorial on W3Schools
SemanticWeb.com, articles and news
Oracle Semantic Technologies Center
Developer's Guide
MicroFormats.org
11 Things To Know About Semantic Web
For fun
Fuzzy Owl