A beautiful visualization about last.fm tastes over periods of time. Processing was used to create this printed poster.
More about the project here : http://www.leebyron.com/what/lastfm/
Not extremely beautiful at a first glance, but I like the way you can interact with the piece to understand a lot of simultaneous data very clearly. Also the main theme of fear of death is exciting
Interactive here : http://www.informationisbeautiful.net/play/mountains-out-of-molehills/