What's wrong with just using a kvm switch? They're cheap enough that I doubt a km switch would be much cheaper. There's also a software package called synergy that might do what you want to do.
well, i have two computers and two monitors... was just looking for something simple to be able to run them both w/o having to keep swapping my keyboard and mouse.
Have you looked at synergy? It essentially lets you use a keyboard and mouse on two computers seamlessly. If not then just get a KVM switch. A KM switch wouldn't be any simpler than a KVM switch.