google is starting to be more open about their data centers...maybe they were influenced by what facebook was doing...very interesting stuff, and it'll give a good idea of the amount of resources needed to run a company like google...
http://www.pcmag.com/article2/0,2817,2411076,00.asp
http://googlegreenblog.blogspot.com/
http://www.google.com/about/datacenters/gallery/#/
http://www.wired.com/wiredenterprise/2012/10/ff-inside-google-data-center/