Microsoft has released guidance on how to deploy a virtualised Remote Desktop Services (aka Terminal Services) Session Host (aka Terminal Server) on a machine/hardware virtualisation platform.
“This document provides guidance on deploying Remote Desktop Session Host (RD Session Host) and other Remote Desktop Services role services in a virtualized environment with minimal hardware resources. The document also provides scalability information for a virtualized Remote Desktop Services role configuration by using the Knowledge Worker scenario to help size hardware for similar workloads”.
If this subject interests you then you should check out an independent white paper by The Virtual Reality Check that compares the performance of Terminal Services on VMware vSphere 4.0, Citrix XenServer 5.5 and Microsoft’s Hyper-V 2.0 (Windows Server 2008 R2 Hyper-V).
I’ve deployed fairly small solutions on Hyper-V and they worked fine. One of the nice things about virtualising them is that you can control your resources nicely: start out small and grow as required in a very rapid manner.