Discover From This Page & Topic: [Discover] semantic_web
[Discover] Content Manager | OpenCalais http://www.opencalais.com/about/contentManager
(webtools metadata tagging webservices) 
[Discover] hakia Search Engine Beta http://www.hakia.com/ (search searchengine tools google)
[Discover] Knowledge Media Institute http://kmi.open.ac.uk/ (semanticweb)
[Discover] Search Engine Land: Must Read News About Search Marketing & Search Engines http://searchengineland.com/ (seo search sem marketing)