Holizz linked me for my Atom 0.3 comments feed, so I figured I'd link him back. He updated the script to Atom 1.0 and provided the modified source code, which, when I've finished upgrading to Ubuntu, I'll incorporate back into my code.
I had originally considered releasing the code with my name on it, a copyright, and an appropriate license, but I had hoped the code would get quickly folded back into Wordpress proper. I should probably email the Wordpress devs and let them know that they're free to have it. Meanwhile, I'll slap the GPL on the code, in order to bring it in line with the Wordpress license.