A huge swath of the web is managed by open source, with the vast majority of the remainder well-positioned to be consumed by open source.
Note: this is "managed" not "served." The web server war was already one by the Apache web server. I think these statistics say a couple of things:
- Open source content management software is out there and performing
- The demographics of the web are changing. Call it Web 2.0. Call it the long tail. Lots of individuals and small organizations are publishing like crazy and the tools they are choosing are open source. Small groups in large organizations are doing the same thing.