Making a screenshot on the Mac is simple, there are a few ways to do it , all of them very simple and easy to achieve.
1) Full screen shot
The first method is just a plain old key combination of Mac-Command Shift + 3, when completed you may here a camera sound and find some new files on your desktop called Picture-1 or screenshot1 and so on. On the latest versions of OSX (Leopard) it seems to output the date and time in the filename, much more handy ! e.g. Screen shot 2009-10-19 at 19.40.38
This outputs two screen shots on my dual screen setup, so it should probably do the same for you, my second file is called Screen shot 2009-10-19 at 19.40.38(2)
This is an example of how the screenshot looks as a file on my desktop.
2) Make a screen shot of the selected area of the screen
Again using a key comibination - this time use Mac-Command Shift + 4 , make a selection of an area. When you release the mouse button it will make a screenshot, the file is saved out in the same format as the above method 1.
Example selection screenshot:
3) This method is a little different to the two methods above as this method is done not with an application, but in the terminal.
If you are familar with Unix this will be a little more intuitive for you, but even if you did not use terminal before just do Mac-Command + Space and enter terminal.
Once terminal in open enter the following command: screencapture ~/Desktop/Screenshot.png
This will also output the file to the desktop with the filename you entered above.
