Are you interested in creating a virtuali infrastructure and offer virtual machines to your customers (maybe cause your are an Application Solution Provider) or partners?
Brian Madden just announced two news whitepaper from Citrix on how to set up this kind of environment (they call it Hosted Client Solutions) with Microsoft Windows Server 2003, VMware Workstation 5.0 or Microsoft Virtual PC 2004 SP1 and Citrix Presentation Server 4.0: