Here is one really useful mac app.
Like most people, our screens and desktops get cluttered within days and we always have to spend time cleaning them up. Also, in many ways the biggest problem with any OS is that we end up with many applications one and one sitting in front of another distracting you at all times. In other words, your screen is always cluttered with icons, windows, pop-ups, toolbars, etc..
This is a great app for mac osx that resolves that issue and lets you concentrate on what you are doing. The idea is simple ...if you ever used Alt-Click which hides current app when clicked on another app or the desktop ..this app does the same thing automatically. You can also shade or hide the desktop all together.
Give it a go and you'll see how much cleaner you screen gets. You can use this in conjuction with Apple+Tab command to switch apps if you hide your dock.
Enjoy
http://willmore.eu/isolator/index.html
(Via Lifehacker)