Nationwide Insurance is a posterchild for the right use of virtualization, on all their platforms. A huge IBM Mainframe shop, they also use Linux in their X86 environment to cut costs and be more green.
“While many IT shops see virtualization as a question of adopting EMC’s VMware on servers running Windows or Linux, Nationwide Insurance has adopted the technology for both x86-based and mainframe-hosted servers. After all,” notes Buzz Woeckener, the company’s zLinux/Unix server manager, “virtualization was invented for mainframes.”
More on Nationwide’s virtual environment