I had to record here this description of Web 2.0 I found by the great George Seimens
Saying web 2.0 is easier than saying “the means by which we alter the existing mindset in computing from centralized broadcast services subject to hierarchical authority structures to open, distributed, read/write methods that permit end-point users to contribute to and even direct conversations and content through social and technological networks”.
My main attraction to the concept of Web 2.0 is what it represents and what it can teach us about how we can evolve education. I guess I'm hoping the evolution from broadcast to collaboration on the web is mirrored in education.