Sharpen Edges
Use a High Pass filter to sharpen the finer edges in your photo.
Global Light Setting
The Global Light setting links all of your lighting angle adjustments in your layer styles.
Picture Package
Replace individual images in your picture package.
Copy Merged
The Copy Merged command allows you to copy a flattened selection from a multi-layered document.
Mask On Mask
You can take a layer that already has a layer mask on it, and add another one if you create a Group first.
Centering
Use the alignment tools to center your document layers.