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The 60 day trial version of MS Digital
Image Suite can do what you require.
Microsoft Digital Image
Starter Edition 2006 http://tinyurl.com/28loxr
(this product line has been
discontinued but you can still
download the Starter Version
and run it for 60 days)
If you use paint.net, there is an "ellipse select" tool that would let you
copy/cut circular parts of a picture, then paste them into a new picture.
There are probably various other ways, as well (that may work in other
programs, too) - perhaps drawing a circle in some colour not in the
picture, then doing a fill outside of the circle with white or transparent?
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