Greg was right. Clay Shirky's keynote, A Group Is Its Own Worst Enemy, is worth reading if you're a developer or core-user of social software (groupware, weblogs-in-communities, mailing lists, etc.).

I especially appreciate his conclusions, which he describes as three things you must accept about social software:

• You cannot completely separate technical and social issues.
• Members are different than users. (Users come and go, members care a bit more about the existence and welfare of the group as an entity.)
• The core group has rights that trump individual rights in some situations.