A fascinating insight into how Google have designed their infrastructure, right from server to datacenter. 12V batteries on each server saves them a fortune from UPS inefficiency, and the design is clearly optimised to handle airflow and still manage the density.
Stripping a load of the plastic and fittings out saves a good bit of resources as well.
http://news.cnet.com/8301-1001_3-10209580-92.html?tag=rtcol;pop
