Wikipedia, the online encyclopedia that anyone can create an entry for, now has a cousin: Citizendium. Citizendium (most easily pronounced 'City-zendium') differs from Wikipedia in the way that content will be developed. Citizendium will not allow anonymous entries, and there will be some form of expert review and editorial oversight to help avoid Wikipedia's issues with slanderous material, outright fabrication, and distortion of facts.
A long term structural weakness of many Internet services has been lack of authentication, or to put it another way, too much anonymity. Anonymity is appropriate and important for certain kinds of things and services, but for popular online resources like an encyclopedia, it just doesn't work. We'll see more and more services offered that require some knowledge and identification of the author of the material, because not to do so creates too many problems.