New technologies benefiting the little guy - power efficiency in small server rooms

Small server room operators have many capabilities:

• hot and cold aisles
• plastic aisle separator curtains
• Liebert XDP/XDV and other in-row cooling solutions

I believe that in the newly popular PUE-type evaluations, small operators can be competitive with the big colos. Moving air big distances takes energy. I buy into the concept that fluids are much more efficient for moving heat around than air. Raised floors in closed systems are no long er the efficient way to do things.