If you hold down the SHIFT and COMMAND key and then at the same time press the number 3, your mac will take a screenshot of your entire screen and save it as a .png (picture) file onto your desktop. Try it right now! Press SHIFT-COMMAND-3, you will hear a camera shutter style sound, and a new file will appear on your desktop. Double click the file – it will be a picture of your screen at the moment you pressed SHIFT-COMMAND-3. This is built right in to all versions of OS X.
You can also capture just a small part of your screen. See this article on how to take a partial screenshot using shift-command-4.
Did you know that if you hold down SHIFT-COMMAND-4 you can take a picture of any part of your screen? Press SHIFT-COMMAND-4 and your cursor will turn into a cross-hair. (Try it right now!) Click and drag over anything and you can take a picture. It’s how most of the small pictures on this website are made.
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I’ve had a few people ask me how I did the screen casts for Dragon Dictate. I used a program called iShowU HD. It costs $29 and you can get it from here. You can also use it to turn a keynote presentation into a Quicktime movie and avoid the sync problems of Keynote’s built in export movie command. Continue reading 〉