Trackback again

There is a good discussion of trackback going on over at Phil Ringnalda’s. Interesting points: “The most visible sort is post-to-post, where one post expands on, comments on, or replies to another post, and so the reply post sends a TrackBack ping to the original post…Though that’s the most visible sort of TrackBack, post-to-category, or category-to-post or -category, are also very useful ways to ping.”