Virtualization
http://www.facilityzone.com/search.asp/?query=virtualization&pr=fzone0207&prox=page&rorder=500&rprox=500&rdfreq=500&rwfreq=500&rlead=1000&sufs=2&order=r&cq=&jump=Virtualization Of Servers Can Slash Energy Use
Virtualization and Other Tips to Slash Data Center Energy Use
Maximizing Data Center Efficiency Gains Through Virtualization