Created my first formal Drupal patch, providing an XHTML content type to the Atom module. Once I walked through the module, and the procedure to apply a patch, it really wasn’t all that difficult to both create the patch, and submit it for review. And the feed validates, though with a warning because of the object element in the last post.
I was surprised at how easy it was to modify the administration form for the module— a couple of lines of code, and that’s it.