Cool. (I think) I have RSS generation working now. Check out the XML button on the right nav. In version 0.92 you’re allowed to have entity-encoded HTML in the description field, so that’s the route I decided to take. Eventually, I’ll update the Publish Jr. code for those interested.
This wasn’t merely as difficult as I had originally thought, and it feels good to help strive toward a standard — even if no one uses it from my site.