One thing I think that Metafilter does really well is, moderators are visible but inconspicuous. For example, comments are deleted, but there is a minimized mod

One thing I think that Metafilter does really well is, moderators are visible but inconspicuous. For example, comments are deleted, but there is a minimized moderator comment reminding people to not flame, telling someone to chill out, etc. I realized I liked this the best. Similar to what dang brought to HN, just a minor comment here or there saying what he's doing behind the scenes. On the other hand, I can't stand how moderation has always been done on BoingBoing, where the moderator is extremely conspicuous, and actively participates in conversations. It is still done in good faith, but it is really uncomfortable and the moderator basically acts like a regular participant who benefits from lighter scrutiny because they hold a banhammer.