I've made some charts for BookBrainz and they're surprisingly enlightening - for some simple examples: the "Birth Countries of Creators" chart shows us that we don't have nearly enough South & Central American authors, the fact that "Registered Editors Over Time" increases pretty much linearly vs how the "Active Editors Over Time" remains more or less constant shows how little of registered users are being engaged in the site, the large gap in the "Total Revisions That Editors Make" histogram shows how much of a gap there is between high-ranking and low-ranking users.

As such this issue is to discuss ideas for similar things in other MetaBrainz projects.