No revolutionairy new thoughts here, but if Google's business is a mystery to you, read the Business 2.0 article. Understanding Google may inspire you for your own (yet to be created) business.
As Google co-founder Sergey Brin put it in the quarterly conference call, AdSense is a "huge untapped resource" that "ultimately will have a faster rate of growth" than Google's main paid-search business. He also hinted that Google is working on some improvements to AdSense that should help make it a bigger contributor to revenue. If that happens, Google will become even more intertwined with the structure of the Web itself.