I started doing the poll, but I found that my preferences were so weak that there didn't seem much point in spending that much time. My preferences were weak because I had no idea what sort of angle you were thinking about taking on the topics.
I'd rather do a poll which asked for something like my three favorite and least favorite topics.
Followup to: Systematic Search for Useful Ideas
I've set up a pairwise poll for this question and additional suggestions are welcome. My original proposal was to examine topics that haven't already been covered here, but instead of that, I'd like to ask people to consider the existing level of discussion on a topic in evaluating what would be "best."
ETA: There are currently over 500 pairs. You don't have to go through all of them -- answer as many or as few as you like.