Publishing to the web has never been easier, with the proliferation of content management systems, online blogging platforms, micro blogging, and more. However, publishing data is either the preserve of organizations prepared to manage their own IT, or requires individuals to sign up for one web 2.0 service after another.

RDFa provides a straightforward means by which data can be published as easily as a web-page can, and the implications are enormous.

This is an interesting video presentation on the topic from Google Tech Talks.