Metafilter, a collaborative weblog, has become one of my favorite sites lately. And from what I hear, it's been getting more popular with other folks as well....more people have been posting there and leaving comments and such. This is both good and bad, I suppose. Diversity of opinion and discussion is good, but as with most collaborative communities like this, it's only as good as the worst participant.
A possible solution for Matt as he moves the site forward is allowing only approved posters to post stories on the front page, but anyone can post comments.....just like Slashdot. I mean, could you imagine Slashdot if *anyone* could post a story? Chaos. There'd be 400 stories a day and they'd all be crap.