Another Apple Technical Note.
Want to learn how you can get the most out of Mac OS X’s Dock feature and the all-too-often-overlooked Application Switcher? Apple’s got a technical note that covers them both.
From Mac OS X: Additional features of the Dock on Apple Support:
The Dock offers useful controls and menus that may not be immediately apparent. You access these additional features with different combinations of modifier keys (such as Option, Control), and with different types of mouse clicks (click versus press and hold). Additionally, learn about Application Switcher, an alternative way to switch between applications without using the Dock or your mouse.
Good reading if you’re interested in tips and tricks for using your Mac.