My new Twitter follower Robin Mulkers (mulkers) pointed me to a great article written by Jeremy Allison, a major contributor to Samba, about the demise of Sun and how their decisions about how to handle their open-source contributions may have been part what killed them.
He brings up a lot of really interesting points that I have also observed about how some people approach open source, and why it may be unwise to believe that you can really win a siege against it. There is great power in openness and we are only beginning to scratch the surface.