Sometimes I get the feeling that all of these free services are Google's way of hedging against possible decline of search/contextual ad revenues. "Oh, looks l

Sometimes I get the feeling that all of these free services are Google's way of hedging against possible decline of search/contextual ad revenues. "Oh, looks like contextual ad revenue will be down 5% this quarter, let's slap some ads on Google Docs and Google Voice for a month to bring it back up!"