Github has this cool way of displaying project contributions, I think they call it "graph" (they even sell t-shirts with an exemplary graph on them: http://shop

Github has this cool way of displaying project contributions, I think they call it "graph" (they even sell t-shirts with an exemplary graph on them: http://shop.github.com/products/contribution-graph-shirt http://shop.github.com/products/contribution-graph-shirt). Looks like karma for pull requests to me.