You keep hearing the phrase Web 2.0, but really what does it mean? Well here is a interesting article that gives you an idea of what it is.

Web 2.0 Arrives
Software upgrades promise to turn the Internet into a lush rain forest of information teeming with new life
By Steven Johnson
DISCOVER Vol. 26 No. 10 October 2005

"The result is the equivalent of a massive software upgrade for the entire
Web, what some commentators have taken to calling Web 2.0. Essentially,
the Web is shifting from an international library of interlinked pages to
an information ecosystem, where data circulate like nutrients in a rain
forest."

It explains how the "old" idea of simply following links on a web page (Web 1.0) is being transformed to a dynamic social web (Web 2.0) with new programs and technologies such as news feeds, blogging, Technorati, and social tagging (del.icio.us). The once static page containing links has evolved into a ever changing information explosion.