Yvain, #2 in all-time LW karma, has his own blog which is pretty great. The community has basically moved there and actually grown substantially... Yvain's posts regularly get over 1000 comments. (There's also Eliezer Yudkowsky's facebook feed and the tumblr community.) Turns out online communities are hard, and without a dedicated community leader to tweak site mechanics and provide direction, you are best off just taking a single top contributor and telling them to write whatever they want. Most subreddits fail through Eternal September; Less Wrong is the only community I know of that managed to fail from the opposite effect of setting an excessively high bar for itself. Good online communities are an unsolved and nontrivial problem (but probably worth solving since the internet is where discussions are happening nowadays--a good solution could be great for our collective sanity waterline).
I haven't visited Hacker News for a while, but it seemed like the leadership there was determined to create a quality community by whatever means possible, including solving Eternal September without oversolving it. I'll bet there is a lot to learn from them.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.