I registered so I could vote on something, decided to see what creating an article was like, and it was so smooth it made me want to start more, and then eventually realize I have been looking for something like this.
I started a list of "Coffee shops in Cambridge, MA" because I remembered that I had been looking for just such a list the other day. I figured it's mostly HN users on there now, probably, and a fair amount of us are from here. I'm not positive what types of lists you're wanting, though, so I won't be hurt if you delete it!
Feature request: I would love to add some simple custom attribute to each list. For instance, with the coffee shops, it'd be nice if I could define an attribute for that list of "Free wifi?" and then each item could select either yes/no as it's created. An article on vim color themes could define an attribute of "Background?" with options "light, dark, both".
At some point in the future, then, you could filter and look at just the items in the list that match an attribute. E.g., I can look at the coffee shops and filter to look at only the ones that give free wifi.
Great work!