A brief description of Concentro's latest:
Designed to augment or replace traditional brick-and-mortar data centers of any size, Concentro features compute density levels of up to 9600 cores in a 40' x 8' container, or up to 3.5 petabytes of storage for maximum density per square foot.Take a look at the pictures from both companies, they look like something out of Knight Rider or Tron.
Google should not be complacent after all, James Hamilton and the rest of the enemy are fighting back. His website has his latest presentations and papers, documenting Microsoft's war effort in this arena.
There is other coverage on Geeking with Greg and Nick Carr (Showdown in the trailer park).