Yo, its the semantic web.
if you're on a website that's part of linked data, like 'myspace.com/radiohead', this command lets you pop around, no bs.
it uses freebase and zemanta.
this way you can read its wikipedia page or whatever.
you can install it as a bookmarklet (right-click bookmark this ), or the ubiquity command.
Ubiquity usage: thisView sourceWhats Ubiquity? - Install it