Those guys at Blizard know a thing or two about keeping the community around their games strong. There are machinima tools, forums, events and a host more things to keep people involved in their worlds outside just playing the games. The Blizzard Fan Art Program is always worth a little look, to see the skills of players in a community gallery like this. Many of them are the kind of work that I like to do - cool stuff.
Here are just a couple that caught my eye for various reasons:
[some of the Blizzard Fan Art from their gallery]