If you have multiple computers with multiple monitors, Synergy is a great way to keep your hands on a single keyboard & mouse. It’s kind of like a KVM, but it’s not.
I have 2 monitors on 1 computer (my main desktop PC) and a laptop that I haul from home to work. Now, I can keep my hands on one keyboard and mouse while I slide my mouse from my big 19″ main screen, over to the right to my 17″ screen and then … magically to the right again onto my laptop!
You can slide from your PC to your Linux to your Mac. Keyboard input follows the mouse. You can copy/paste across boxen! It’s magic, and it’s FREEE!
I was up and running in < 5 minutes.
I took down the original post I made about Synergy a week ago because I wasn’t ready to recommend it; there were some crashing problems. I found out that the crashing issue was quickly fixed (1.2.5 was no good) and I had just come in at a bad time. I had written to the author when I saw the poor performance and he got right back to me, pointing out that he had very recently posted a fix.