Many of us have had the "pleasure" of working with a pair of forked projects. Normally, this is an exercise in patience and reading code with extreme precision, but sometimes it is a whole other level of frustration.
In particular, I have spent a lot of time banging my head on FFmpeg and Libav, both of which generally provide identically named shared libraries which provide identically named exports, but are slowly diverging and offer slightly different functionality. Perhaps I am a complete n00b, but I have found it anything but easy to anticipate which one I will get when I install or later call upon anything prefixed with "ffmpeg" or "av", let alone develop code against them.
Because of that, I was very concerned when I started taking a serious look at Pillow, the self-dubbed "friendly" fork of PIL. On the surface, I am in love with the project and its call to action. However, I am afraid of the project's assumption of the "PIL" namespace, and how that will inevitably break other code in interesting ways.