Check this out...
"The U.S. government could save billions of dollars by moving to more open-source software, cloud computing and virtualization, a recent study suggests. Over three years, the potential savings would be US$3.7 billion for using open-source software; $13.3 billion for using virtualization technologies; and $6.6 billion from cloud computing or software-as-a-service, the study said. It was published by MeriTalk http://us.rd.yahoo.com/dailynews/pcworld/tc_pcworld/storytext/studyfederalgovtcansavebillionsinitspending/31043699/SIG=10q7earg9/*http://www.meritalk.com/, an online community about IT and public policy; Red Hat, an open-source software vendor; and DLT Solutions, a value-added reseller of Red Hat
and other IT products."