In the report titled "Cisco gaining mind share in security", there is an interesting paragraph on Virtualization:
The survey consisted of 259 information security professionals.
All but 2% of the Fortune 100 participants said they had virtualization "in use" in their organizations or had plans to use, with 33% expecting virtualization to impact their security procurements. Check Point was cited most frequently as a vendor they chose to solve security concerns at this stage, the InfoPro report states. Among midsize enterprises, 41% said they were "very concerned" or "extremely concerned" about security in a virtual environment due to concerns about the complexity of it introducing a higher level of security risk.
In a question about cloud computing, the survey found about 35% of Fortune 1000 companies said they were already using cloud-computing services, with 25% planning to use them in the next two years.