"The goal of the Apache Abdera project is to build a functionally-complete, high-performance implementation of the IETF Atom Syndication Format (RFC 4287) and Atom Publishing Protocol (in-progress) specifications."
"Journals exposes a very complete API for creating and managing blogs, entries, and comments. I'm working on getting the API documentation up on dev.aol.com sometime soon. But it's very easy to get started with basic blog posts."
Joe Gregorio: "The current revision of the AtomAPI is contains quite a few changes from previous revisions. All of those changes have been talked about seperately, but when put together represent a fairly large change to the API. Here is Quick Reference