The September Open Thread, Part 2 has got nearly 800 posts, so let's have a little breathing room.
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.
If you have new formal arguments about decision theory, it would be much more useful to me (and others, I think) if you just posted them here in their current state instead. Or emailed them to the interested people.