CMS Watch has a great editorial about the proliferation of open-source content management systems.
I’m thinking about getting an open-source CMS, and I am indeed overwhelmed by the variety of choices. My guess is that it won’t be too long before the Darwinian process of adoption and abandonment selects the fittest of the projects and narrows it down to a few choices. In the meantime, we’re going to have to spend a little extra time sorting through this mess.
However, I don’t think this chaos gives a huge advantage to commercial CMS vendors, who haven’t addressed the rampant dissatisfaction with their “solutions”.