For an quick overview of web 2.0, check out this video by Michael Wesch. It is the best explanation I have come across of the ways web 2.0 is changing communication. Thanks to Sean Bohan for the pointer.
But now that we’re there, let’s take a step back. The nightly network news has a viewership of about 26 million people according to the Project for Excellence in Journalism. That number has declined steadily over the past 25 years as cable and the internet became more prevalent news sources.

Good video.