Free: XnView for your Pocket PC

This is a nice utility that lets you "visualize, organize and improve your images and photos". It also "writes images" in different popular format. I'm not a fan of image-editing software, but this one seems to be full of interesting features. Read more on http://www.xnviewpocket.org/features.html.

Posted on the go using my superb HTC S620 smartphone.