Yahoo! Custom Search's topic extraction tool is officially released.

The release of Yahoo's Custom Search thematic keyword extraction tool

Last month, the Custom Search service in Yahoo's Webmaster Tools was testing a feature for extracting relevant themes from a page. Since it was an initial test, it was only possible to manually adjust parameters to change the style. Now, this feature has been officially added to Yahoo's Webmaster Tools, known as the "thematic keyword extraction tool."