I just came across this article, "We Are the Web," by Kevin Kelly of Wired Magazine. It's about 2.5 years old now, but it's a great history of where the Web has come from and where it's headed. In case you have not seen it before here's the link: http://www.wired.com/wired/archive/13.08/tech.html
I found it mentioned indirectly in a presentation by Michael Wesch, an Assistant Professor of Cultural Anthropology at Kansas State who's exploring the impacts of new media on human interaction. Thanks to Dave Austin who sent a link to one of Wesch's online videos, which provoked me to run down some of his other work. Here's a bio of Wesch: http://www.ksu.edu/sasw/anthro/wesch.htm
The thing Kelly is describing may be the real Web 2.0. Ultimately this will affect not just how we teach and how we think, but how we do almost everything -- the biggest collaborative project in the history of the planet.