atomixlib
Sylvain Hellegouarch created atomixlib, a Python library to create Atom feeds using Amara.
As I needed the same functionality in BODI, I asked if I could port it to use ElementTree. He agreed, and the result, one week later, is at http://trac.defuze.org/browser/oss/atomixlib/. Announcement here.
He and I hold joint copyright on it, and will continue to support it together (he's already made fixes on the ElementTree portion, and I have already suggested a feature on the Amara side).