Learn Full Gimp Interface In Half An Hour

Gimp Tutorials - Tutorials from the official Gimp website

Gimpology - Tutorials for the Gimp

Fractal Backgrounds

Pixel2life - Gimp Tutorials

Gimptalk - Gimp resources and tutorials

Gimp Guru - Image editing tutorials for Photographers

Grokking theGimp - Downloadable book to learn advanced image editing techniques

Bin-Blog - Creating Web 2.0 graphics in Gimp

Gimp User Group - Tutorials

Gimp Tutorials - Tutorials and usefull snippets

About.com - Learning the Gimp

Tips for using the Gimp

Design your own Web - Gimp video tutorials

Tigert - Gimp Tutorials

Ghuj - Tips and tricks to learn the Gimp

Jane’s Photography Stuff - Gimp tutorials for photographers

Tux Magazine - Touring the Gimp (PDF) - In this first article, Michael J. Hammel offers a tour of the cabilities

Linux.com - Running Photoshop plugins in the GIMP, even under Linux