Virtual Desktop Products
Microsoft Virtual PC 2004 http://www.microsoft.com/windows/virtualpc/default.mspx
VMware
Workstation 5.5 http://www.vmware.com/products/ws
Virtual Server Products
Microsoft Virtual Server 2005 R2 http://www.microsoft.com/windowsserversystem/virtualserver/default.mspx
Virtual Iron Software Virtual Iron http://www.virtualiron.com
VMware Server http://www.vmware.com/products/server
VMware ESX Server 2.5 http://www.vmware.com/products/esx
SWsoft Virtuozzo for Windows 3.5.1 http://www.swsoft.com/en/products/virtuozzo
XenSource Xen 3.0 http://www.xensource.com
Virtual Application Products
Softricity SoftGrid 4.0 http://www.softricity.com/products/softgrid.asp
Altiris Software Virtualization Solution http://www.altiris.com/Products/SoftwareVirtualizationSolution.aspx
Hardware-Based Virtualization
AMD's Virtualization Solutions http://enterprise.amd.com/us-en/Solutions/Consolidation/virtualization.aspx
Intel Virtualization Technology http://www.intel.com/business/bss/products/server/virtualization.htm