Drag a file out of the stack

In Leopard, stack will come in handy for managing files. When you set the stack as a grid or a fan, you can drag the file out of the stack directly.

Just click the icon in Stack and select the file and drag it to any folder, Mail.app, desktop, etc.

As a bonus while you are at stack, click the stack icon and press Command + a to highlight the application beginning with an A, Command + s for file beginning with S, and so on. You can also move around the stack by the arrow keys and press Return/Enter to open it.