The other day I was thinking it could be fun to mine Github for developer personality traits. It could pull down their info and plot them along various axes, such as
* how much they follow through with projects
* how much they contribute to other people's projects and how much other
people contribute to theirs
* frequency of swear words in their commits
* How long they take to fix bugs
* What ratio of their pull requests are
actually pulled
* What's the average size/number of files
touched by each commit?
You might even be able to guess at development methodology by looking at whether branches are short-lived (feature branches), how often they merge, etc.