AppStop

AppStop is an awesome utility and I recommend it to every Mac user. It's a Menu Bar item that allows you to freeze an application, so that it does not consume CPU cycles. And why is that so great? Because if you are like me and do a lot of stuff in the computer, like using Dreamweaver, then Fireworks, then back to Dreamweaver, then BBEdit, and other heavy applications that takes ages to open, you can just freeze them with AppStop and unfreeze when you wanna come back to it. One of the most creative and impressive utilities I've ever seen.