Get to know Mission Control (formerly Exposé), and configure it to your liking. Personally, I use hot corners to quickly show all running app windows or the des

Get to know Mission Control (formerly Exposé), and configure it to your liking. Personally, I use hot corners to quickly show all running app windows or the desktop at my whim. This is (for me) an perfect replacement for Alt-Tab and the Start Bar in Windows. You can also drag and drop while using Mission Control, which is really handy when dragging between Windows, or to and from the desktop. I think this feature is understated.