A funny thing has happened on the path to virtualization Nirvana: We’ve stopped, or at least greatly slowed, our progress toward highly virtualized data centers. Gartner says that just 16% of data center loads are virtualized, and our own survey shows ambitions for virtualization are actually backtracking. “We don’t know what the savings are. We just know they’re there,” is a common response. At the same time, our InformationWeek Analytics survey found that 35% of respondents say they expect to virtualize less than 25% of their data centers by 2011.