TweakPNG Command Line
TweakPNG is a tool that allows for easy creation and deletion of PNG and MNG file sections. Besides saving space, it allows for the gamma chunk to be deleted, which prevents color correction in Internet Explorer. The original version was written by Jason Summers, and an be found at http://entropymine.com/jason/tweakpng/.

Screenshot

My version of the program adds command line support, and optional integration into Windows context menu for PNG and MNG files. With one click, you can easy strip nonvital information out of multiple images at once.

Right Click Menu

This program was written in Visual C++, the installer was written with the Nullsoft Installer System. It is free to download, and released under the GNU license.