Photoshop CS2 limits you to make a complete screen copy only and not a copy of an individual window or smaller object. I used Snagit as an alternative, but it used too many resources and has lots of options we Photoshop users never tend to use. It's also not free.
FastStone Capture however is:
http://www.faststone.org/FSCaptureDetail.htm
Note that it's only available for Windows. It uses very little resources (I have it running all the time), never crashes and is easy to use. It can capture windows, full screens, selections, even has an editor. Output can be redirected to clipboard, file, printer or internal editor. Now when I press Alt+PrintScreen I'm able to copy anything I want. It can even capture scrolling windows, like web pages, so you can make a screen copy of a complete page. Great tool.?
