I think that embedded microformat data is the Next Big Thing. Of 2007, at least: Official Google Maps API Blog: Microformats in Google Maps .

Nice.

Not only can your browser (with plug-ins as of today) do something interesting with the microformats, it also gives a lot more intelligence to search engines and anything else paying attention to the pages you’re viewing.

The pre-Next Big Thing: how do people agree on emerging microformats so that we don’t have macro-babel?