Web 3.0, but what?

We could not even catch the Web 2.0 train(how possible; everyone gets different things from "Web 2.0".). Nowadays I've been reading some articles about companies that calls themselves as "Web 3.0" companies. What is this idiocity? Is web something that has new releases every six months? Or can anybody call a new application or business scheme just incrementing the "Web"'s version number?
All this is non-sense. Web 2.0 is all well; social networking, rss feeds, user generated content, AJAX-enabled applications. But what is the real outcome of it? Can we use internet in everyday life as pure "Web 2.0"? There are many obstacles in Web 2.0, and now we are trying to understand web 3.0.