I'll piggy back on my last post and remind you that you can look deeper in the websites I post links about. For instance, on Adobe.com there is some other stuff to look through:

• Actions - An action is a series of commands that you play back on a single file or a batch of files.
• Brushes - Photoshop brushes allow you to add paint strokes that simulate different painting and drawing techniques. They can be organized into brush libraries and shared among users.
• Custom Shapes - Custom shapes are shapes that can be used over and over again, and shared with others. Photoshop stores custom shapes in a shape library that’s available from the options bar when you select the custom shape tool.
• Displacement Maps - To produce their effects, some filters load and use other images, such as textures and displacement maps. These filters include the Conté Crayon, Displace, Glass, Lighting Effects, Rough Pastels, and some Custom filters.
• Filters - Filters let you apply special effects to your images, such as impressionistic or mosaic effects, lighting effects, and distortions.
• Gradients - Gradients create a gradual blend between multiple colors. Photoshop can store gradients in a gradient library that is available from the options bar when you select the gradient tool.
• ImageReady Actions - An action is a series of commands that you play back on a single file or a batch of files.
• ImageReady Droplets - A droplet is a small application that applies an action to one or more images that you drag onto the droplet icon.
• Patterns - Patterns are images that can be stored in libraries and reused, often with the pattern stamp tool.
• Plug-ins - Plug-in modules are software programs developed by Adobe Systems and by other software developers to add features to Photoshop and ImageReady.
• Scripts - Special instructions to the software (i.e. JavaScript) to perform automation of various operations.
• Styles - Styles can be any of a variety of effects—such as shadows, glows, bevels, overlays, and strokes—that let you quickly change appearance of a layer’s contents.
• Templates - Templates are normal Photoshop documents designated for a specific use. For example, a CD-cover template may contain the outlines of a booklet that is properly sized for a CD jewel case.
• Tutorials - Tutorials on Adobe Studio Exchange come in a wide variety of formats. Please note that tutorials are created by private users and not by Adobe Systems, Inc. Adobe has not reviewed the contents for accuracy or bugs.