ScreenHunter 5.1 Free
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Full user review
"It just works, nicely."
You push an F-key, you tell it what you want captured, and it does it. Simple.
If you want a fancier graphic format, it won't do that. It does BMP, JPG and GIF. (I do a lot of fancy stuff including web design, and these have been adequate for me.)
It uses 12Mb of RAM in Standby (a little high).
It does what I want it to do, and it's free. I keep putting it on PCs (mine and others').