Pivot is a Microsoft Live Labs project that tries to make it easier to interact with massive amounts of data on the Internet.
At the heart of Pivot are 'Collections.' Collections combine large groups of similar items on the internet, so we can begin viewing the Web as a 'web' rather than a series of isolated pages. Anyone can create collections of their own.
Find out more on the Pivot Developers page, where there are tools available to assist in the generation of your own Pivot Collection