John Robb: "Radio is a fully decentralized system. Even better, it provides you with a complete back-up of your weblog on your desktop and the ability to add to your weblog while disconnected. Given that it is decentralized, you can opt to self-host your weblog at your ISP or on your corporate Intranet in under a minute."...
It's not only about centralization vs. decentralization, is about freedom and Content Management Systems.
With a single copy of Radio I'm updating this weblog (which is hosted on a linux server), 3 company k-logs (hosted on another linux server), and weblog I use for a teaching program (hosted on an iMac with RCS). Sure, I could use three different programs to manage all these weblogs (btw: we also develop a CMS that is centralized!) an different servers but, in this case I would not have a Content Management System, but a Totally Messed Up Content System. Try to get this: this very post is appearing at the same time on three different weblogs. This can happen because the CMS is centralized, but it is centralized on my own PowerBook, not on some remote server.
The server on which pages are sitting is not the center of the system, it is just the front end, the center is where the core of the contents is.
Besides, with Radio I can manage my InstantOutline, can collect news and run several useful other tools.
In this wonderful brand new web services world, we have the freedom to run code and store contents just where it's better, and the content management system for my weblogs is better run from my desktop.
Now, it's late, let me take my iPod and go home... but this is another story.