Not long ago a hot online discussion is about web 2.0, and now another people are talking bout Web 3.0. So what is web 3.0?

Web 3.0.
Some label Web 3.0 as “adding a layer of meaning on top of the existing web”; a concept commonly referred to as the Semantic Web. In this iteration, sites, links, media and databases are “smarter” and able to automatically convey more meaning than those of today.

For example, a website that announces a seminar would also contain programming with related information embedded with in it. A user could clik on a link and immediately transfer the time and date of the conference to their electronic calendar.
The location - address, latitude and longitude - could be sent to their GPS device, and the names and biographies of others invited could be sent to an instant messenger list.

From Revenue Magazine