This weekend I stumbled upon Coveralls [0], a service that provides code coverage statistics for open source projects.
Currently I added it to the TravisCI build of both Ask and Diff, which was really easy to do [1]. You can find reports on the coveralls site [2], and can also get a quick idea of the coverage status via the badge on the documentation page of the relevant component [3].
I've been wanting this kind of reporting for a long time, so we can track the general trends of our coverage, and spot commits that significantly lower it. So this coveralls thing is quite awesome \o/