AtomPub is now RFC5023 which is very good news. I’ve been waiting for AtomPub and decent libraries for it for a while because it starts to answer one of the main criticisms I have of REST - that there’s no mechanism to build reusable infrastructure pieces. With Atom and AtomPub we finally have that (for the places its needed).
I’ve been playing around with Apache Abdera in the last week or so and while I think the API and samples could do with a bit of work, it’s functionally pretty good. Now, back to that AtomPub based project….

I would encourage you to stop by the Abdera user’s mailing list and post your thoughts on the kinds of improvements you’d like to see made to the API. We already know the samples and docs need some work