Gimp-Tutorials
Having used both GIMP and Adobe Photoshop I must say I personally believe GIMP is much better for common folks like you and me who need a relatively simpler set of tools to make quick edits to our Vacation pictures. Photoshop is undoubtedly more useful graphic designers, however for making quick tweaks, nothing beats GIMP. Recently GIMP 2.6 was released, so I decided to make this tutorial for those who still haven't discovered the magic of GIMP and don't know how to use GIMP productively.1.
5 GIMP Tricks Everyone Should Know!
GIMP is the favorite graphics editing program of many designers and graphic artists. It is free and compatible with Windows, Mac and Linux (the two big reasons for its popularity). It has a wide array of features, as well as plug-ins, filters and brushes.
Handy Tweaks To Make GIMP Replace Photoshop - Smashing Magazine