Zynga dominates the casual online games space, but Electronic Arts recently proved with The Sims Social that there's room for big brands. Rovio is currently developing an online world for Angry Birds. But when it comes to brands, there's perhaps none bigger than Hollywood celebrities. And new game company Entertainment Games is licensing Hollywood icons for players to use as playable avatars in Retro World, which will launch in November as a free-to-play game...