Don't want to spend all that money on Photoshop? There is a free alternative, GIMP, or GNU Image Manipulation Program. A good alternative with a lot of support and plenty of tutorials to help you learn GIMP. Here is a list of a few GIMP Tutorials. Most of the sites these GIMP tutorials are on have many other tutorials. These should be enough to get you started though.

GIMP Tutorial - The User Interface
gimp tutorial

GIMPLite Quickies
gimp tutorial

Important GIMP hotkeys
gimp tutorial

Transparent Glass Lettering
gimp tutorial

Glow Effect
gimp tutorial

How to Create a Gradient Background Image in GIMP
gimp tutorial

Making a Web 2.0 Logo in GIMP
gimp tutorial

Make a Gimp pattern from scratch
gimp tutorial

Quickmask Tutorial
gimp tutorial

How To Create Your Own Website Design Using Gimp
gimp tutorial

BG Tutorial 1: Caution tape
gimp tutorial

Vista Button
gimp tutorial

30 Ultimate Web 2.0 Layer Styles for Gimp
gimp tutorial

Popularity: 12% [?]