Just to point out the disparity of costs between decentralized publishing and centralized publishing. Say you have 100,000 people that you want to enable to publish a weblog. Given that these are weblogs and not simple homepages (like GeoCities) that are published once and forgotten, a couple of things change. People use the functionality daily, if not several times a day. They also build massive sites. Compared to a one or two page “designed” personal home page on the last generations site builders, the user of a weblog system will quickly find themselves publishing sites with hundreds if not thousands of pages. They get big fast.
He has a little more to say about p2p/distributed weblogging, and I think he’s on target with what next-gen publishing/weblog systems will have to be in order to succeed.