Picture Viewer/Editor

I run xnview from my flash as a portable image utility. From the help file:

"With XnView you can quickly and easily view, process and convert image files. The universal program is able to read more than 400 different formats and then convert them to other formats such as GIF, BMP, JPG, PNG, multi page TIFF. XnView can also display video formats, many digital camera formats and more exotic formats such as Amiga IFF and Calamus. "