While I am on a steep learning curve myself with photoshop, being told how to do something is one thing. But sometimes being SHOWN how to do something is so much easier for me to understand. Especially when you dont understand the "lingo" of all the complexities of Photoshop. I have been shown a site and have been watching video tutorials that can be downloaded and watched at your convience. They arent really dial up friendly but they sure help me understand somethings that before I just shook my head at.
Their video tutorial called "A Photoshop Reference: Essential Adjustment Layers" is almost an hour long and huge at 113 megabytes, but is a fantastic reference. It will improve your fundamental understanding of color post processing and how to use adjustment layers. It could permanently alter your workflow. It has something to teach both new and advanced PS users.