<< This video tour of a Google data center highlights the security and data protections that are in place at our data centers. >>

http://www.youtube.com/watch?v=1SCZzgfdTBo

http://googleenterprise.blogspot.com/2011/04/security-first-security-and-data.html

Upcoming Hamina data center is mentioned in this video and probably some material is alao from Hamina, Finland

Also
http://www.theregister.co.uk/2011/04/23/google_data_center_security_video/