I finally made the switch from Adobe Photoshop to GIMP, and it was a success. Here are some beginner's how-tos and tutorials that I found useful and can help you start photo-editing with GIMP.
on 06/24/2009 – Made popular on 06/24/2009
The GIMP (GNU Image Manipulation Program) is an Open Source Graphic Editing Program. Although it’s not as powerful as Adobe Photoshop, it has one very big advantage over Photoshop – price. Photoshop CS5, the latest and greatest version, is retailing at $500+ American Dollars whereas The GIMP is FREE
GIMP 2.6.9 is released. For newbies, GIMP is the GNU Image Manipulation Program. As you can infer from the name, GIMP is completely open source and is also free as in free beer. GIMP is pitched as the open source alternative for Adobe Photoshop. GIMP is cross platform and yes, GIMP has a Windows version also.