Sounds like a line from a certain “pointy-haired boss,” doesn’t it?
I use a MacBook Pro running OS X Leopard as my main system at the office. I have a secondary display connected to it and I use the built-in “Spaces” feature. My secondary system, a desktop, is running Ubuntu 8.10 workstation. For several months now, I have had two keyboards and mice to deal with. There had to be a way to share one keyboard and mouse between the two systems.
Enter the utility, Synergy.