Arguably computation models seen in client space are much more diverse than those in the server space proper. For servers, there are essentially two, the model of static consolidation and the more recent dynamic model where virtual machines lightly bound to their physical hosts and can be moved around with relative ease. With virtualized clients there are also two main models, depending on whether the application execution takes place in servers in a data center or on the physical client. This article examines some of the general issues and concerns regarding client virtualization.