You might want to check out Ewan Macintosh's excellent webcast (link is in this blog-post) on Web2.0 in education, or "What happened to Web1.0?"What Is Web 2.0? - Robin Good's Latest News:
"In Web 1.0, a small number of writers created Web pages for a large number of readers. As a result, people could get information by going directly to the source: Adobe.com for graphic design issues, Microsoft.com for Windows issues, and CNN.com for news.