Skitch is a screen capture tool that, may won´t be especially useful in professional circles (a server, for example, couldn´t use it for all their daily tasks), is excellent for making occasional screenshots and editing them at the same time.
Skitch then, combines features from an image capture program, with those from an editor, to offer a unique experience. With a simple key combination, you can capture any section of the screen you like. Once done, you get passed through to the editor where you find lots of useful tools.
These tools range from the classic coloured markers, to object tools for arrows etc, to text editors complete with an underline function. Each of the tools, including one to 'censor' the images, is designed to work perfectly with screenshots.
Skitch is a great tool that will work well for anybody who wants to make screenshots on their PC and then edit them. Once done, you can upload them automatically to the Internet.