Synergy lets you easily share a single mouse and keyboard between multiple computers with different operating systems without special hardware. It's intended for users with multiple computers on their desk since each system uses its own display.

Development Status: 5 - Production/Stable Intended Audience: Developers, End Users/Desktop License: GNU General Public License (GPL) Operating System: All 32-bit MS Windows (95/98/NT/2000/XP), All POSIX (Linux/BSD/UNIX-like OSes), Linux, Solaris Programming Language: C Topic: Desktop Environment Translations: English User Interface: Win32 (MS Windows), X Window System (X11)

Looks pretty cool...