Two New Features
I'm realizing how much of my own experience as a user of this site drives the development. I really want to revamp my lists, but I don't want to lose the old content and discussions. So it is now possible to archive content. Archived content will continue to show up in search results, but will no longer appear on your public profile or in the "recent updates" box.
The second feature is less significant, but I still like it: you can now choose to automatically number a list.