[karmakazi]

Here's another one I use... FSCapture.... really low resource usage, its free, and good options to boot!

What's New in FastStone Capture 5.3:
Version History of FastStone Capture 5.3

* Compatible with Windows Vista
* Improved quality of 256 color PNG/GIF output
* Added To Email to the Output list
* Added Reset to Primary Screen (only available in Multi-monitor system) to the tray icon\'s popup menu

About:

FastStone Capture is a powerful, flexible and intuitive screen-capture utility. It allows you to capture anything on the screen including windows, objects, full screen, rectangle regions, freehand-selected regions and scrolling windows/web pages. It has innovative features such as a floating Capture Panel, hotkeys, resizing, cropping, text annotation, printing, e-mailing, screen magnifier and many more.
FastStone Capture Features

* A small floating Capture Panel that can be dragged anywhere or minimized to the Windows tray area
* Resource friendly - uses a very small amount of memory, especially when minimized to the Windows tray area
* Global hotkeys to activate the program's capture capabilities anytime, anywhere
* Efficient tools to capture windows, objects, full screen, rectangle/freehand-selected regions and scrolling areas
* Capture web pages in Microsoft Internet Explorer, FireFox and Opera
* Option to specify destination (internal editor, clipboard or file) where the captured image will be sent
* Screen color picker
* Text/Arrowed line/Highlight/Watermark annotation
* Drop-shadow, torn-edge effects
* Add comments
* Resize, crop, brightness, contrast, gamma, sharpen, blur, gray, negative