Dave Winer has announced that the Frontier kernel on which Radio is built (and the foundation of the service that this and many weblogs are provided through) will become open source at some time in the future. I am not exactly sure what that means or how to take the announcement buried deep in a rambling post today.
No doubt it signals a large change in strategy for Userland -- but it confuses me why Dave would announce it on his site before any official Userland announcment (at least if the information is on Userland's site I can't find it).