Here is an excellent video called "Web 2.0 ... The Machine is Us/ing Us" by Michael Wesch, Assistant Professor of Cultural Anthropology at Kansas State University.

Brilliant, beautiful and informative. Tells you what Web 2.0 is. Asks you what it means.

My thanks to my friends (and the software) at Touchstone for "bringing this to my attention".

Bottom Line: Ask not what Web 2.0 can do for you; instead ask what you can do for Web 2.0?