Microsoft has published a new whitepaper on Windows Server 2008 power savings, and the results and methodologies of the tests run to develop the paper.
This is an excellent document, which outlines the test results (downloadable in separate spreadsheets) and the role of virtualisation in optimising energy efficiencies in your data centres.
Check it out at: http://www.microsoft.com/downloads/details.aspx?FamilyID=61d493fd-855d-4719-8662-3a40ba3a0a5c&displaylang=en
