The following are articles in my Delicious library that include the tag "Web3.0."
From Digital Inspiration: A post on, "Web 3.0 Concepts Explained in Plain English." It includes a comparison of the three "versions" of the web and a presentation on the evolution of Web 3.0.
From Harold Jarche: A post on, "The Evolution of Web 3.0". It includes his comparison of "the three webs" as well as a link to his Delicious collection of articles tagged "web3.0."