Force Quit With Option-Click in the Dock
If you have trouble remembering the Force Quit key combination (Option-Command-Esc) or hate hunting down the Force Quit dialog under the Apple menu, here’s a Snow Leopard shortcut.
Hold down the Option key while clicking an app’s icon in the Dock. Up will pop a contextual menu with Force Quit. It also presents a Hide Others option, which I use a lot. Quick and easy.