If you have multiple computers on your desk and want to control them all with a single keyboard/mouse...you got to try Synergy.
I have a Windows box and a Linux box at work. I had both systems setup next to each other. I was constantly using the wrong keyboard/mouse when I would switch systems.
Now I use Synergy and just a single keyboard/mouse. When I want to switch to my Linux box from Windows, I simply drag the mouse cursor on Windows in the direction of the Linux monitor and the mouse pointer magically appears on Linux and all keyboard input now goes to the Linux box. When I want to go back to Windows, I just drag the mouse cursor back towards the Windows monitor. It looks like a dual-monitor setup because the mouse just slides back and forth between the two computers as if it were the same mouse.
How does it work? One system is a server (in my case, my Windows box) and one is a client (my Linux box). The server has the keyboard/mouse attached to it. When you move the mouse to an edge, Synergy redirects keyboard/mouse output to the client over the network connection. It works like a software-based KVM switch (but doesn't do the video).
It even supports copy/paste between systems! And when my screen-saver kicks in on Windows, my Linux box does the same...and they both wake up when I touch the mouse.
It is definitely better than a desktop filled with keyboards and mice for multiple systems.
And best of all, Synergy is free!
Highly recommended! Give it a try!