How to do a screen shot (screen capture, print screen) on Mac OS X

Since several month now I am working on a MacBook Pro.

Mostly using Windows 7, first via Boot Camp now via Parallels.
But I am also using more and more it's native operating system
(Mac OS X Version 10.6.8) and also Mac OS Applications.

The first trivia I had to check out was how to do a "screen shot"
 ("screen capture", "print screen") - I found this very simple ways:

Screen shot of complete desktop:

• Hold down 'Shift key' + 'Apple key ⌘'
• Press 'Key 3'
• Done - you will find the picture on your desktop 

Screen shot of part of desktop:

• Hold down 'Shift key' + 'Apple key ⌘'
• Press 'Key 4'
• The cursor will change to a 'cross selection'-style 
• Select any portion of the screen (with two clicks)
• Done - you will find the picture on your desktop

Screen shot of a application window:

• Hold down 'Shift key' + 'Apple key ⌘'
• Press 'Key 4'
• Press 'Space Bar'
• The cursor will change to a 'camera'-style 
• Select the application window (one click)
• Done - you will find the picture on your desktop

And yes, this is very very easy to do ! :-)

(On Windows 7, I mostly used the 'Snipping Tool')