Towards a common schema for web content

For those interested in tagging, check out this article about schema.org which is described as

Schema.org -- launched in June of 2011 -- exists to support this initiative and develop the categories and tag sets for commonly used items across the Web.

To me, this is a great development. Well worth looking at if you need some ideas on how to classify and 'tag' web content and information published on the web.