Capture by George is on of those programs. Ok it's a screen capture program which is hardly rocket science but this one is so simple to use it's perfect. A neat TV like remote control appears on the screen along with a square with rulers all round, all you do is drag and size the square with pixel accuracy to the bit you want to capture and press capture on the remote.
Simple buttons come into play next.
It really is as simple as that. A very well presented piece of software which does exactly what it says and with ease and quality.