ACM Crossroads - Introduction to the Gimp
Student magazine of the Association for Computing Machinery. Crossroads has published an article about the Gimp, and has an online discussion forum related to it.

Everybody loves The GIMP
GIMP guru and plug-in writer. Keeper of the nexus of GIMP links and information.

Gimp PDB Documentation
Gimp Procedural Database Documentation created by gimpdoc.

GIMP-Savvy
Resources for learning the Gnu Image Manipulation Program. Includes the complete text of "Grokking the GIMP" an advanced book on practical image editing techniques.

GIMPwin Information
A collection of various GIMPwin-related stuff. Currently mainly a HOWTO-gimpwin-gtk-themes is provided.

GimpWin installer
Provides installations packages for GIMP on Windows.

GTK+ for Windows
Uses Tor's libraries to create installation packages of GTK.

GTK-Wimp
"Windows impersonator" is a GTK theme that blends well into the Windows desktop environment.

Jon Peterson
An interface critique of The Gimp

Jürgen's GIMP Stuff
Submit ideas for something to be added to the GIMP. The wish list is a list of ideas for hacks/modifications/improvements of the GIMP.

Planet Gimp
Collection of Gimp artwork and a tutorial.

Sunny Spot
Includes a set of brushes, plugins and several scripts for Gimp users.

WinGIMP
Win32-related GIMP information.

Zach's GIMP Stuff
Some collected information, tutorials, news and a FAQ forum.