This tutorial is a big one, however, it will save you a great deal of time than if you were trying to learn Photoshop by yourself ...
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Photoshop for Beginners
Adobe Photoshop is a photo editing and manipulation software with uses ranging from editing of large numbers of photos, to creating digital paintings and drawings that represent those done by hand. In this technical skills lesson, you will learn the basics of Adobe Photoshop to transform your photography.
Intro to Photoshop with Daniel Scott
This tutorial is a big one, however, it will save you a great deal of time than if you were trying to learn Photoshop by yourself ...
Short Photoshop Tutorial with Vince Opra
Here's a shorter tutorial and a bit of an insight into the benefits of being able to use Adobe Photoshop.
3 Quick Fixes in Photoshop with Alan Becker