Alright, I seem to have finished the atom feed exporter. The whole thing is less painful than I thought. Check out the shiny button:

clicking should tell you that this is a valid feed.

Haha. Of course, the atom button invalidates the feed because muse’s html generator doesn’t insert </P> tags everywhere it should - and it doesn’t yet escape > and < correctly. But for now, this will work well enough.

See also Muse-Atom.TODO.