Greenshot is a light-weight screenshot software tool for Windows with the following key features:
Quickly create screenshots of a selected region, window or fullscreen; you can even capture complete (scrolling) web pages from Internet Explorer.
Easily annotate, highlight or obfuscate parts of the screenshot.
Export the screenshot in various ways: save to file, send to printer, copy to clipboard, attach to e-mail, send Office programs or upload to photo sites like Flickr or Picasa, and others.
…and a lot more options simplyfying creation of and work with screenshots every day.