1. Ability to toggle "Suggestions" on and off for each list.
    I love suggestions, but some lists are meant to be self-contained works by a single auteur, as it were. It can be awkward to have Suggestions lingering below when you'd rather not add them to the list proper.
  2. Dual Lists
    It's a single post, with two related lists! "Favorite movies of the year/least favorite movies of the year." "Reasons I'm losing my edge/reasons I'm not losing my edge." I'd be into this sort of thing, because my thoughts are often in opposition to one another.
  3. Numbered lists - ability to reverse the numerical order into a Letterman style countdown.