I honestly keep hoping that subreddits will be implemented here sometime soon. Yes, "off-topic" discussion technically doesn't fit the stated purpose of the site, but the alternative of having LWers interested in having off-topic discussion having to migrate off-site to some other discussion forum seems ridiculous to me.
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.