Just a few ideas - take them or leave them.
  1. Poll lists
    Just a list with items people can vote on.
  2. Ability to like a comment
    Sometimes I don't have a good response, but still want commenter to know I've seen it.
  3. Topics
    This is a tough one as many lists aren't exactly the same, but something similar to the featured banners, just more of them.
  4. Direct messaging/private lists
    Sometimes I don't want to comment publicly. Also private lists maybe? Like I could tag who I wanted to see it.
  5. A screen where you recommend me and only me to new listers.
    You know, putting your best foot forward and all.