Lots of other stuff there on 3.0 -- some slideshares and discussion.
In the above, we've got widget hosting services (iGoogle, etc.) as part of a 3.0 scheme... these belong still in Web 2.0. Mid-to-late 2.0 developments. Don't nobody jump too quick. For the barest beginnings of yr semantic Web world, look to WolframAlpha. But that's the thing with all this -- we can't, on our blogs or in our magazine articles or books, decree what Web 3.0 is or will be or ought to be. These 'versions' of the Web get defined slowly, building up like coral. Folks do stuff, that stuff is cool, that cool stuff gets popular, the way folks use the Web changes, then we all look back and say "wow -- that's Web x.x"!