<http://schema.org/url>
<http://massively.joystiq.com/2008/12/10/tabula-rasa-crafting-what-didnt-work-then-and-what-works-now/>
<http://www.engadget.com/2008/12/10/tabula-rasa-crafting-what-didnt-work-then-and-what-works-now/>