Chris Wanstrath 
GitHub Learning Pathways: Learn from the best
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Ilya Grigorik has posted an article on visualizing with code_swarm. He looks at Ruby on Rails and our own Scott Chacon.
A video of Rails’ commit history is available in HD on Vimeo.
At around the 5:05 mark, the number of contributors increases because Git (unlike Subversion) properly attributes the author of a patch. Very cool to see.
