Reader and programmer Robert Daeley points out that for Mac users who cannot download Snippy, the following Mac-specific commands should be helpful:
Best Snipping Tool for Mac If you want a snipping tool packed with additional features, download Skitch, from the creators of Evernote. Skitch is a free snipping tool app for Macs that also allows you to easily draw arrows, boxes, add text, resize the image, and much more. Best Snipping Tool for Mac If you want a snipping tool packed with additional features, download Skitch, from the creators of Evernote. Skitch is a free snipping tool app for Macs that also allows you to easily draw arrows, boxes, add text, resize the image, and much more. The CloudApp snipping tool is the best equivalent to the native Mac app. It is quick and easy to use and saves you snipping time by uploading all snips to the cloud, without having to open a.
Download of the Day, Part II: Snippy
Use free Snippy (Windows) to copy a part of your screen. Instead of grabbing the entire screen or…
Read more ReadApple-Shift-3 takes a screenshot of the whole screen. Another one that most people don't know about is Apple-Shift-4, which produces crosshairs that can be dragged to grab just a portion of the screen.
OS X also comes with the Grab utility, with which you can grab a selection, a window, the screen, or a timed screenshot.
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Snipping Tool For Mac App

Thanks, Robert!
Update: Nicholas points out some additional specifics:
Apple-Shift-4 then spacebar takes a screenshot of just a particular window. And Apple-Shift-4 then Control copies the screenshot to the clipboard.
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Thanks, Nicholas!

Related:
Snippy
Mac keyboard shortcuts
[posted by Eszter]
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CloudApp also makes it super simple to record HD videos, in full or select parts of your screen with audio as well as with a webcam feature. As with annotations, there are several ways to do this on both a Mac or a PC:
For Mac:
- Use shortcut 'Cmd + Shift + 6' to capture a section of your screen, choose the HD video option, and click the Start button to record. You can also select the [ ] to capture full screen (customize the shortcut in Preferences menu)
- Click the CloudApp icon installed in your menu bar (top of your screen) or Applications Folder, then select the TV 'Record Your Screen' icon and select a part of your screen to capture and record
Snipping Tool For Mac Air
For Windows PC:
- Use shortcut 'Alt + Shift + 6' to capture a section of your screen, choose the HD video option, and click the Start button to record. You can also select the [ ] to capture full screen (customize the shortcut in Preferences menu)
- Click the CloudApp icon installed in system tray (bottom right of your screen) or Programs Menu, then select the TV 'Record Your Screen' icon to select part of your screen to capture and record
Best Snipping Tool For Mac