Any project that you work on in Photoshop will have some repetition. Certain projects (like creating seamless pattern tiles) will have a lot of repetion. By following the next two steps, you should be able to speed up your work considerably.
First, learn some common keystrokes. It will only take a few minutes, and I promise you won't regret it.
Here are the keystrokes that I use most often. Mac users, substitute the Command key for the Control key:
Ctrl+A Select all
Ctrl+C Copy
Ctrl+V Paste
Ctrl+S Save
Ctrl+D Deselect
Ctrl+Z Undo
Ctrl+U Adjust Hue/Saturation
Ctrl+X Cut (useful for layers)
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