They use Screenpresso:
Capture full screen, part of the screen or a specific window with the same shortcut.
Capture scrolling part
Can't fit it on the screen ? Make a unique image thanks to the stitching mechanism.
Capture HD videos
Record your screen in video (MP4, WebM, WMV, OGG) and export in HTML5
Built-in image editor
Crop, spotlight an area or comment parts of a captured image, add drop shadow, rounded corners, reflection and more.
Don't bother to save screenshots or videos on your drive, Screenpresso does it for you.
Easily share your screenshots via Evernote, Box, Twitter, Facebook, G-Mail, Flickr, Minus, Dropbox, Imgur, ImageShack, YouSendIt or FTP.
Share videos on YouTube
Quick send your screen capture on YouTube HD to create screen cast.
No need to install the application, you can run it directly after download.