adaptive blue has released a header/meta tag scheme to simplify semantic tagging of content items - http://www.readwriteweb.com/archives/wine_film_and_books_adaptive_b.php "Semantic web company Adaptive Blue has published what it hopes will become a standard for publishers who want to signal in their header tags when a webpage is primarily about a particular book, film, wine or other type of objects. From search to trend analysis to a richer browsing experience - the developments that could come from adoption such a standard are many. "Called AB Meta, the format was developed in concert with a number of other web companies and is aimed to be part of a larger effort to pick up where existing Semantic Web and microformats markup leaves off. It's simple and extensible. ... "Bloggers who want to mark up particular pages or post pages with AB Meta can do so using Dougal Campbell's HeadMeta WordPress plugin. Some post-level meta data editing is possible with Typepad but Blogger users are out of luck. Hopefully someone will build a UI for self-publishers. "For commercial publishers and retail sites, the AB Meta standard should be much easier to implement across their sites. In addition to the new spec drawn up to describe objects, AB Meta also leverages existing Dublin Core markup when available."