It is difficult to understand the possibilities in virtual worlds, especially if you do not personally use them. But we are beginning to see online worlds, that people use in much the same way as Usenet and bulletin-boards where used in the days of early internet. But also for a very wide variety of other activities, and I think we are getting close to a situation where we will think of virtual worlds as a new media. We will compare the virtual worlds with the Internet, television, radio, print, movies and computer games. I have not been able to find a really good large comprehensive article on virtual worlds, and the significants of these. With for example a comparison to Web 2.0. But I do like this little blog posting on Techcrunch.