This article makes some really good points about the relationship between open source and global collaboration along with making a case for reduced vendor lock-in as a driver for open source.
However, the relationship between cost/pricing and open source seems a little weak. The article says that "without prices that approach zero, there is simply no room for viable open source options." This seems to imply a causality that may or may not exist.
I have posted a few more details on my blog at http://opensourceculture.blogspot.com/