Evolution of the Web to Web 3.0

Web 3.0 Concepts Explained in Plain English (Presentations) from Digital Inspiration (May 2009)

This is brilliant - Web 1.0, 2.0, 3.0 explained in a single slide of points, some text, and 5 excellent slide presentations. As the note on the page explains, the two about the red stamp describe the semantic aspects and workings very clearly.