Someone mentioned it the other day, and it is fucking awesome. Though how no one has thought to mention it before now i don't understand. Like 4 of my friends have been using it for quite a while.
Anyways, awesome program and i setup another monitor and computer just cause i could, and not have to worry about a 3rd mouse. Now, its only one mouse, 3 computers, full mouse and keyboard control.
http://synergy-foss.org/