What's Web 2.0????????????????

Web 2.0 is really starting to mean a combination of the technology (like AJAX)
allowing the customers to actually interact with the information.
Web 2.0 is starting to mean the situation where amateur writers
and developers are able to create applications and
Web sites that get more credibility than t
raditional news sources and software vendors.

(reference: http://webdesign.about.com/od/web20/a/aa021306.htm)