I often work with two Macs at a time - my PowerMac and a MacBook Pro. I navigate between the two of them using Teleport, which allows you to control multiple Macs with one mouse and keyboard, simply by mousing over to the other machine, as if it were a second display. It even lets you copy and paste from one machine to another, and drag and drop files across machines. Pure hotness.

As I’m usually glancing back and forth between the two machines, it can sometimes get to be irritating when one of them switches on it’s screensaver or sleeps. To prevent this, just give the Mac a healthy dose of Caffeine. When running, the app is a simple little icon that appears in your menubar, and takes only one click to toggle on or off, preventing your Mac from entering sleep mode or activating it’s screensaver. The best part? It’s free!