Barriers to entry in open source projects.
One of the things that I've seen to be a downside in many open source projects is that while they embrace the licensing, but not necessarily the ideals that go with it.
It's all too easy to forget that the strength of open source is in it's community, and there are too many examples to mention of projects where getting involved in their communities is way harder than it should be.
Knowingly, and unknowingly, projects create barriers that prevent effective entry into the community and effective participation. How much of this is really necessary? How much of this is harmful, and how much can be done about it?