As of 2009, Parallels Workstation 2.2, is available for free (normally $49.99 U.S.) until the offer is discontinued. A full license activation key will be immediately sent to you via e-mail.
I learned of the Parallels Workstation at Gizmo's Freeware under Hot Finds...
http://www.techsupportalert.com/view/hot (http://www.techsupportalert.com/view/hot)
I am hoping that eCS as a Guest under my Vista Home Premium on the new Acer Aspire Laptop will be a much friendlier install than under M$ Virtual PC 2007 or Sun VirtualBox. At any rate, the price is right, with a permanent activation key for commercial software, that will "talk nice" to either OS/2 and eComStation.
P.S.: Gizmo's is a good place to locate freeware, or free commercial software, to tame the fragmented files world of Windows XP or Vista.