Nova Spivack delivers a nice Semantic Web presentation at NextWeb. My only differences with Nova are:
-- Timeframe - I believe we are closer to 2020 than he envisages
-- Business models - there are going to be new business models courtesy of the Semantic Web effect.
Anyway, enjoy!
BTW - The only reason why the Semantic Web is perceived as complex relative to the original Document Web is simple this: The Semantic Web was designed in public view by the W3C and many collaborators, whereas the Document Web simply came into public view and consciousness as a somewhat finished solution.