MWSnap is a small yet powerful Windows program for snapping (capturing) images from selected parts of the screen.
I prefer 300 x 125 pixel size images on this blog and with MWsnap I can achieve it in a snap. I am sure you will find this tool very helpful. Another small clean and nice utility without using much resources of your computer.
MWSnap does not require installation and does not need any special dlls, drivers or system files which can mess up your system.
Download it here and enjoy.