Google Site-Flavoured is a project from Google Labs that aims to categorise website pages according to clear themes.
It has long been a concern of the SEO/SEM community that Google will one day employ theming as an integral part of its ranking algorithm, making it even harder for new sites to establish a place in the search results - an issue covered by Platinax in Google Update: Yorkshire.
The ultimate suggestion is that only links from pages within the same general category will have real effect on a site pages's ranking in a search for keyphrases in related categories.
However, the Site-Flavoured test from Google Labs is the first public demonstration of how this technology could be developed.