For Linux users (and probably Mac, and other *nix systems), one of the best programs for quick and easy photo manipulation is the shareware xv program. It is distributed as a C language source code package. Being shareware, though, you have to hunt for it, rather than just point-and-click in synaptic.

Informally known as the "swiss army knife" of image viewer/editors, xv really ROCKs!

I often wonder why Windows users have such a hard time posting photos, and the answer is probably lack of something as lightweight (to use) and capable as this.

Cheers