Google already searched the entire Web. Google already had a distributed framework with thousands of independent machines. Google already looked for the links between pages, the way they fit together, in order to build its index. Google's search engine solved equations with millions of variables. Semantic Web content, in RDF, was just another search problem, another set of equations.
August 2009: How Google beat Amazon and Ebay to the Semantic Web (great fiction writen by Paul Ford).