If you were paying attention at this year's E3 tradeshow, one of the clearest trends is that massively multiplayer games have arrived. One of the major reasons, of course, is the success of Blizzard's 900-pound gorilla, World of Warcraft. More than that, though, WoW's success has served to bring the once-niche genre into the gaming mainstream and forced developers who want to compete to offer something more than just another WoW/EverQuest clone.