deadsea - 7:52 pm on Jun 2, 2011 (gmt 0)
Google just put out a blog post on schema.org. It looks like they are moving their data "micro-format" markup to a standard that is supported by the big three search engines.
Last year one of my sites implemented micro-formats for business listings. We put special tags in our pages that identified the business name, address, rating, and other information in a machine readable format. In return we got enhanced display in the SERPs. Specifically, the business rating that we provided turned into stars in the search results. We saw a nice boost in click through rate with the enhanced display.
At the time it was an invite only program to participate and yahoo wanted us to do the same thing but the markup was different and incompatible. Hopefully this means that any website can implement these and get the benefits of the enhanced display with any search engine.
The range of data that can be marked up is interesting:
There is markup for: