WinSnap is a small enhancement utility for taking and editing screenshots. It can easily capture windows of non-rectangular form with the background of your choice, automatically perform simple canvas transformations and coloring effects, add professional smoothing shadows in Photoshop style and more. Also, WinSnap supports variety of image formats and provides advanced auto-save features.

NTWind Software (http://www.ntwind.com/software/winsnap.html)