There are 3rd party solutions
google turned up [link|http://www.codetek.com/ctvd/|CodeTek VirtualDesktop] and [link|http://space.sourceforge.net/|space.app]. Probably others as well.
Darrell Spice, Jr. [link|http://www.spiceware.org/cgi-bin/spa.pl?album=./Artistic%20Overpass|Artistic Overpass]\n[link|http://www.spiceware.org/|SpiceWare] - We don't do Windows, it's too much of a chore