Short cut Keys are a way of Life!

There is little in the computing world that I enjoy better than shortcut keys. The mouse is to be avoided at all times. It slows you down, makes you weak. Like a frail old woman, with large bulbous fingers. Shortcut keys are one reason I like the Mac system so much. It's full of standardized shortcuts that make me pen italian sonnets to show my love for them.

Note: I'll use "apple" for the command key (the one with the apple on it)
and "ctrl" for the control key, because I'm lazy.

Obvious:
apple + c -- copy
apple + x -- cuts
apple + v -- pastes
apple + z -- undo (if available)

In the Finder (Desktop):
apple + tab -- can switch between open applications very easily.
apple + h -- hides an application
apple + q -- quits an application
apple + w -- closes windows
apple + delete -- deletes item
shift + apple + delete -- empties trash
shift + apple + n -- makes a new folder
shift + apple + a -- opens up to the "applications" folder

In Firefox:
apple + t -- opens new tab
apple + n -- opens new window
apple + w -- closes current tab / window
ctrl + tab -- switches between tabs
apple + l -- highlights URL so you can go to a new location
apple + r -- reloads page
/ -- search on page -- very helpful. try it now. do it.

General Text:
apple + left / right arrow -- move to far right / left of line
apple + shift + left / right arrow -- select all to the left / right


This is barely scratching the surface, but it's a good start.
Here's a link to apples shortcut site: ClickMe


What's your favorite shortcut?