If it's worth saying, but not worth its own post, even in Discussion, it goes here.
This is the feed I use for Main posts: http://lesswrong.com/.rss
(but it has a longer lag than my feeds for other sites, but the time it pops up in Greader, there are way more comments than I expect)
If it's worth saying, but not worth its own post, even in Discussion, it goes here.