Introducing schema.org: Search engines come together for a richer web
All I could think while reading through the getting started was: that is an awful lot of added text.  After a little more thought: that is an awful lot of added work.  And while it won't be hard to have tools that make the process easier, the sort of work that goes into adding that data can never be completely automated (otherwise, we would have no need for it).  Given that all the search engines will be using it, all major sites basically have to implement this or they risk falling in their rankings.So, at the end of the day, Google, Microsoft, and Yahoo just made web development more expensive.  They probably also just made the web a better place, too.