If you're running Mac OS X Panther(10.3) or Tiger(10.4) here's a tip for you. Ever have many applications open at the same time? Need an easy way of switching between them? Hold down the Apple key and tab key on your keyboard and you should get a bar across you're screen displaying all your open applications. While holding the Apple key down use the tab key to navigate through each apps icon. When you get to the icon for the open app you want release both keys and you'll go to that applicaiton. This is something I use all the time.