Show Faces of Members!
Allow members to have a small picture of them in their profile which shows (if they want) when they post a message. It might not appear to be something big but it really really gives a feeling of more closely knit community. For example i love to interact with many old members here i even like to visit their sites but i never get to see how they look. If you know whom you are talking to, its much more comforting. I dont mean to say it will bring more users or it helps our "webmaster" theme, but yes it does help community alot. Take "Face" out of "FaceBook" and see what happens. Give Face to WebMasterWorld and again see what happens.
For example, few weeks ago Brett Replied to one of my threads for the first time ever. I have seen his pic it was so so nice to read that message even though it was just about a feature of the forum, But it really makes you want to interact on the forum more when you know the other person a little bit. I would love to see jatar_k, coopster, hawk_girl, Engine, Mack, many more and i am sure it would make me interact on the forum more and more. Maybe i cant put it in proper words but i feel it will have a huge impact on how this "World" develops now on.
Afterall we are all social animals, give a little bit "social" touch to this community. Birds will fly in, and Stay.