Be the best member of your site. Lead by example by participating as much as you can in your own community. This is a good way to attract other well-intentioned members of your site and also reminds everyone a real person is behind it all and building the best community they can for everyone. Speak honestly and be supportive of other members. When I think of all the communities I'm a part of, the ones I love are the ones I see the creators using everyday.
Source: fortuitous: Some Community Tips for 2007: http://fortuito.us/2007/05/some_community_tips_for_2007
Contributed by: ~C4Chaos