Quick Image Viewer (qiv) is a very small and pretty fast GDK/Imlib image viewer. Features include zoom, maxpect, scale down, fullscreen, brightness/contrast/gamma correction, slideshow, pan with keyboard and mouse, rotate left/right, flip, delete (move to .qiv-trash/), jump to image x, jump forward/backward x images, filename filter, and you can use qiv to set your X11-Desktop background.

qiv also supports the assignment of external commands (like metacam) to unused keys.