Synergy
May 2nd, 2007synergy: [noun] a mutually advantageous conjunction of distinct elements
Synergy lets you easily share a single mouse and keyboard between multiple computers with different operating systems, each with its own display, without special hardware. It’s intended for users with multiple computers on their desk since each system uses its own monitor(s).
Redirecting the mouse and keyboard is as simple as moving the mouse off the edge of your screen.
Synergy also merges system clipboards, screen savers and screen locking. It works on Windows, Mac and Linux. Check it out.