Dave Winer has put up a new document-in-progress called Trackback in the UserLand environment, which covers his work in implementing TrackBack in Userland's Manila and eventually Radio. It's great to see the protocol being more tightly integrated and adopted in new publishing systems. Ping!

We've created a guide called A Beginner's Guide to TrackBack, since some people were having trouble understanding exactly what the TrackBack protocol does and how it can be used. The explanation is from a beginner's perspective, and should be clear enough to get you started.