I think this article has a good point re community building. When a group of people move, it takes more effort to get them to start and stop (social momentum).

I think this article has a good point re community building. When a group of people move, it takes more effort to get them to start and stop (social momentum). Transparency of the source of software allows the external community to plan and train, and do other group-oriented things that a single-developer shop can do with more agility.