So far I've been focusing on bookmark presentation and management. The software can import from Sabros.us and present the bookmarks in a similar manner to Sabros.us. Coming up: support for Atom 1.0 feeds, and an easier way for me to add bookmarks to the database.
The thing that's making this so exciting is how well Django continues to expand to meet my needs, and in powerful ways. It consistently surprises me. I don't have a product I'm able to showcase yet, but soon I will. What fun!
Update: I added rudimentary support for feeds in about 20 minutes. In the process, I discovered that Sabros.us has been quietly limiting URLs to 100 characters, which means that some of my bookmarks are worthless. That makes me disappointed.