People used to use the web as a source of information they used to read about news on CNN.com, about graphics issues on Adobe or Macromedia or about Apple news on Apple. But every thing is rapidly changing now, people want to write as well as they read they want to share their opinions and thoughts for the world to read it and comment it.
Content on the web now is dramatically increasing making it really difficult to track all the web sites that provide the kind of information you need, the solution is Web 2.0 which is forcing itself on the web.
Web 2.0 is a new way of thinking of the web that put the content at the first priority in which web content is broken up to "microcontent" units that can be redistributed by technologies like RSS, to make it easy on a reader to get all the content he want in one place.