Synergy!
Synergy - “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).”
This sounds great. Usually I’ll fire up VNC or something to get to my other machine, but this sounds like an even easier solution. Even copy & paste between works.