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FastStone Screen Capture (freeware) - Win
It allows you to capture anything on the screen including windows, objects, full screen, rectangle regions, freehand-selected regions and scrolling windows/web pages.
http://www.faststone.org/FSCaptureDetail.htm

Gadwin PrintScreen (freeware) - Win
Create a screenshot suitable for saving or printing. Then just hit a key on your keyboard. Oh yeah, you will have to download this program first.
http://www.gadwin.com/printscreen/

HyperSnap (shareware) - Win
[$35] HyperSnap is the fastest and easiest way to take screen captures from Windows screen, and text capture (TextSnap™) from places where normal text copy is not possible.
http://www.hyperionics.com/hsdx/index.asp

MWSnap (freeware) - Win
MWSnap is a small yet powerful Windows program for snapping (capturing) images from selected parts of the screen.
http://www.mirekw.com/winfreeware/mwsnap.html

RumShot (freeware) - Win
Rumshot is designed to create a beautifully framed preview in a few seconds, as well as taking screenshots of your desktop.
http://shellscape.org/rumshot/

Screenshot Captor (donationware) - Win
Screenshot Captor is a program for taking screenshots on your computer. Optimized for taking lots of screenshots with minimal intervention.
http://www.donationcoder.com/Software/Mouser/screenshotcaptor/index.html

TimeSnapper (freeware) - Win
TimeSnapper is an Automatic Screenshot Journal. It runs in the background of your computer, taking screenshots of your desktop every few seconds all week long.
http://www.timesnapper.com/

WinSnap (freeware) - Win
WinSnap is a small enhancement utility for taking and editing screenshots.
http://www.ntwind.com/software/winsnap.html?