Virtual Desktop Screen
If you are like me where you have to give support on several different systems and are constantly hopping desks looking for a free mac or linux, or you have several machines in front of you and you are having to switch between machines using a kvm switch you are going to love this tool synergy.
I lined up 4 Desktops and monitors with different OS that I constantly use. I then installed synergy on all machines, after 15 mins I was in control of all machines using only one mouse and keyboard and Scrolling typing and opening programs from left to right across all desktops as if the computers where welded together
Matt Cutts shows how to configure Synergy in six steps