If you still don't understand why humans have made so much hype about the Web 2.0, and you think that its a crap, you should watch
Web 2.0 - The Machine is Us/ing Us (YouTube Video)
Web is like growth of a civilization. The civilization of the netizens. And when we say 2.0, we appreciate our growth. We are more organised. We are teaching the machine.
Read Prof Wesch's blog, on what he has to say about the video he made.
We've seen revolutionary changes in the way we work on internet. We think the change deserves a name, Web 2.0.