heShot is an easy-to-use screen capturing tool that lets you take snapshots of the image on your monitor and then mark certain areas on it. It is a shareware screen printing application that's well-designed, user friendly, advanced and light on system resources.
Here is a screenshot to illustrate the features and user interface of this application:
PicPick
WinCam
SmartCapture
HyperSnap
Snagit