The Photopic Sky Survey is an interactive 5000 megapixel photograph of the entire night sky stitched together from 37,000+ photos. A beautiful example of data aggregation, annotation, and exploration. One of the coolest parts? It was done by an “amateur” photographer, just because he wanted to. (project site)
An addictive collection of beautiful charts, graphs, maps, and interactive data visualization toys -- on topics from around the world.