Google have a great business model.
Aside from having a virtual monopoly on internet search advertising revenue, they champion open-source software saving a packet on R&D and developer salaries, stick loads of Google branding on it, shove as much advertising as they can get away with and rake in the profits with very little effort.
Genius. Lets just hope they don't blow the lot on space travel grow a social conscience and try and cure cancer or something. Cross your fingers.