I picked this up from Lone Wolf Librarian (again - it's a library blog worth the RSS feed).
Web 3.0 Concepts Explained in Plain English
"Web 1.0 - That Geocities & Hotmail era was all about read-only content and static HTML websites. People preferred navigating the web through link directories of Yahoo! and dmoz.
Web 2.0 - This is about user-generated content and the read-write web. People are consuming as well as contributing information through blogs or sites like Flickr, YouTube, Digg, etc. The line dividing a consumer and content publisher is increasingly getting blurred in the Web 2.0 era.
Web 3.0 - This will be about semantic web (or the meaning of data), personalization (e.g. iGoogle), intelligent search and behavioral advertising among other things."
This blog posting has 6 web presentations on Web 3.0.
1. The Evolution of Web 3.0 (28 slides)
2. Why Web 2.0 / 3.0? (101 slides)
3. WWW 3.0: This time it's personal (130 slides)
4. Web 3.0 (44 slides)
5. Web 3.0 Explained with a stamp : The Basics (45 slides)
6. Web 3.0 Explained with a stamp : The Techniques (51 slides)