How to take screenshots in Mac OS X?
On Windows, I just hit PrtScrn. On my MacBook, there is no such thing.
What utility/app can I use for screengrabs?
Using keyboard shortcuts:
All screen shots will appear on your desktop. To save the screenshots to the clipboard instead, you need to hold the Control key.
There's a built in tool with the Mac OS X called Grab in your /Applications/Utilities folder.
It allows you to make a timed screen shot as well as select the cursor shown on the screen.
Making video captures:
Snow Leopard allows for video capture from the screen by using Quicktime Player X. Select File > New Screen Recording, and press the record button.
Third party tools
There exist many third party utilities that do the same as the above and some offer some nice features like an album system or a built in video editing suite. I'm sure a web search can help you if you need any more direction.
Several options are available:
Command-Shift-3: Full screen in a file on the desktop
Add CTRL (Ex. Command-Control-Shift-3) to have the shot written in the clipboard instead of a file on the Desktop.
Tap Space bar to switch from selection mode to window mode.
You can get these answers by searching for "Screenshot" in Mac Help as well should you happen to forget the key combinations some time, so you can find them again easily, and even offline.
I find Skitch to the best application for taking and sharing screenshots - Skitch.com