Again, one of those little things a Mac does better. Sometimes, say for creating instructions or whatever, you need multiple screen shots as you go through the processes. It's a huge pain in the ass going back and forth pasteing and saving. On a mac ofcourse, it actually creates a file on the hard drive, so you can just snap the picture and move on to the next shot. When your done, you can go back and open them alll in photoshop for editing or place them as in in any program. As a little extra, it makes the sound of a cameras shutter to let you know you've captured the shot. Just my 2 cents.