Postimage is a very easy to use application that was especially designed to provide you with a means of taking snapshots of your entire desktop or of a portion of it. You can manually set the area size and after the capture is made, the image can be saved or shared online directly. Postimage can also send to the system clipboard the URL of a shared screenshot, so you can save it easily.
What's new in this version:
Version 1.0.1 fixed a few minor bugs.