In addition to virtualizing server OSs and applications, you may want to consider virtualizing desktops. VDI allows you to run a thin client on existing desktop hardware or new thin client hardware, and access a virtual Windows 7 or other desktop operating system. This means that you can provide Windows 7 desktops to users whose existing systems will not support Windows 7 running locally. Management can also be simplified, since patches to Windows and applications can be applied once and take effect for every system on the VDI server.

There's a reason virtualization is being used so extensively through most corporate data centers. It in hardware, energy usage, management costs, and it supports great fault tolerance.