Adobe Photoshop is probably the most powerful image editing/graphics creation application in in the world. Although Photoshop’s interface is intuitive enough for an absolute beginner to learn basic image editing tasks, it's not really easy to fully master and utilize all of its tools. That takes a considerable amount of time.

In order to become a Photoshop specialist, or at least to try to become one, here is a list of 16 tutorials that can be found on the web. These will help you to utilize some of the tools that Photoshop offers.

Getting Started with Photoshop [Software Tutorials]
Adobe Photoshop Interface Tutorials - Photoshop Essentials
My Damn Channel
Photoshop’s Toolbox | Tutorial9
Photoshop’s Pen Tool: The Comprehensive Guide - Psdtuts+
Photoshop’s Painting Tools | Tutorial9
Adobe Photoshop Tutorial: Understanding Layer Masks - Photoshop Basics - Photoshop
Layer Styles in Photoshop | Tutorial9
Working with Layer Styles - understanding Drop Shadows | PSDTOP Blog - Design Tips, Photo Effects, Icon Creation, Special Effects and Links
Photoshop CS4 Video Training - Introduction to Blending Modes | Free Photoshop CS4 Video Tutorials
Photoshop’s Filters | Tutorial9
Mix&Mash: "Background Eraser Tool" is the new Magic Wand
A Comprehensive Introduction to Photoshop Selection Techniques - Psdtuts+
Adobe TV
Saving Images for the Web | Tutorial9
Using Palettes in Photoshop | Tutorial9

If you know where to find other good PS tutorials, feel free to post them here.