Pictures are etched best when converted to a pure black and white (1 bit, not 8bit grayscale). This is typically how newpapers print pictures. It also means you might need to make a different graphic without all the shading as it does not come out well when etched.
I would like to add DA and Limitless Aero to the list.
BTW, look who is copying this... http://www.GiantScaleNews.com/forums/showthread.php?t=93556
What!!! They copied your idea, well they suck!!! I know my vote doesn't count so I will hold back. This is looking good guys!