Second Life lets you make, buy and sell property in-game. World of Warcraft specifically forbids you. Flickr is all about creating your own content. How should we handle user-generated content in MMO experiences?
"MMO players play a significant role in creating the game, to the point that the creation of the game could be considered a partnership. Blizzard might provide the polygons and the servers, and script a few missions, but the intrigue, the stories, the emotional involvement, are all made by the players. What contributes more to the game’s sense of fun – the polygons, interface and horde of AI bad guys you fight, or the fact that using VoIP, you and people from all over the planet can execute a flawless ambush, then have a good chuckle about with your comrades it on the forum?"