Linux Newbie Guide by Stan, Peter and Marie Klimas
Linux Newbie Guide_ Shortcuts And Commands
LinuxQuestions.org- Easy 'info' guide - LinuxAnswers
Linux Documentation Project

GIMPguru.org: Image Editing Tutorials for Photographers
Sampling Toned Images with The GIMP
Creating a Neutral Density Filter with The GIMP
Creating a Contrast Mask with The GIMP
Sepia Toning with The GIMP
Simulating Film Grain with The GIMP
Simulating Infrared Photography with The GIMP
"Smart" Sharpening, Redux
Blending Exposures with The GIMP
Soft Focus Portraiture with The GIMP
GIMP Plug-In Registry
Creating a Neutral Density Filter with The GIMP
Creating a Contrast Mask with The GIMP
GIMP Plug-In Registry
Reducing CCD Noise with The GIMP