Stumble upon..

The name says it all: Levitated , a beautifull clock, hilarious helpdesk files, Google's page ranking explained, The Quantum computer, Creative Commons Open books, Stereo images, and this site and this are only a couple of sites i've stumbled upon with StumbleUpon: a social network, Firefox plugin and "Recommendation based site search engine", all-in-one. A great add-on tool for OpenBC, Orkut or any social network !