It's interesting that in contrast to the likes of Google and HP who have been stating that the cost of power will soon be greater than the cost of servers — e.g. http://bits.blogs.nytimes.com/2008/11/03/kill-an-energy-hog-... Microsoft seem to be having a very different experience with servers making up 61% of the TCO and power consumption and distribution/cooling only taking up 16% and 14% respectively.
It's also interesting that they haven't (seemingly) adopted the Google strategy of shifting workloads from data centers based on the external weather conditions, e.g. http://www.datacenterknowledge.com/archives/2009/07/15/googl... — This sounded like an ingenious idea when I first heard about it and am surprised that everyone didn't copy it straight away.