Byrne Reese: "James Snell authored an Atom extension that provides a way of syndicating not only a weblog posts, but all of the comments belonging to a weblog as well. The extension is called the Feed Thread Extension and has been implemented on the blog you are reading now (here is an example comment feed). Of course, this eatureis invisble to most if not all of my [human] readers, but this feature can be used by aggregation services and feed readers alike to facilitate the reading of comments made on my weblog using third party tools."
Very nice. Thanks Byrne!