1) Most Popular - looking only at the quantity of movies added to member's queues (and shipped), we come up with this set of lists. Clearly, being in this set will further make the lists popular - so we only look at popularity over the past week, and also (since the list is really longer than the 20 shown) we randomize which ones we present and the order.
2) Most Recent - we get thousands of new lists each week, and we will pull randomly from that set each time this block is refreshed. Gives new lists a chance to shine.
3) Lists Selected for you based on the movies in your Queue and that you've rated - This is a slightly different version of the personalization we do in the block you see on the Community Home page; but the effect is similar: we look at highly rated movies and movies you've just moved high in your queue, and find member's lists that include those titles.
4) Featured Members - here we look at members who have created at least a few lists (but not necessarily a lot), find those generating a good quantity of additions to queues, and then sort by similarity % to you -- and then present a sampling of the top ones. It's really just another way to find interesting similar members.