Microsoft building container based datacenter

Just a followup to the previous conversations on power and rack density I
see that Microsoft has announced that one floor of their new Chicago
datacenter will be container based.

Each 40 foot container will house 1,000 to 2,000 systems with between 150
and 220 containers on the first floor.

Main links:

http://www.datacenterknowledge.com/archives/2008/Apr/01/microsoft_embraces_data_center_containers.html
http://datacenterlinks.blogspot.com/2008/04/miichael-manos-keynote-at-data-center.html
http://mvdirona.com/jrh/perspectives/2008/04/02/FirstContainerizedDataCenterAnnouncement.aspx

Related link:

http://www.datacenterknowledge.com/archives/2008/Apr/04/microsofts_198_megawatts_of_motivation.html