"SearchMonkey is the first product from a mainstream
search engine provider that takes advantage of Semantic Web
technologies to enable you to produce more relevant search results
and thus drive more traffic to your Web site. With common Web
development technologies such as PHP, XSLT, and XPath, provide a
better experience for searchers as you use structured data encoded
in Web pages using Semantic Web standards such as Microformats,
eRDF, and RDFa." free registration required--ed.