hAtom has been created to enable using HTML documents as syndication feeds. It was been built after studying the emergent semantics of blog publishers (ie, what are the common HTML elements and attributes in blogs and other syndicatable media) and existing syndication formats (ie, RSS and Atom).
Anyway, hAtom looks really promising and after ironing out some issues in a face-to-face meeting at MashupCamp, we put the 0.1 stamp on it and are now inviting people to start using it seriously.
So, if you have a blog, or any other publishing system that could do with some syndication, have a go at implementing hAtom on your site. If you run into any problems or have any questions, feel free to jump into one of our discussion channels to ask for help.