I have another one!
What about a Copy Button Style & Paste Button Style. In working with Photoshop, I have fallen accustom to coping a layer style and pasting that layer style.
Example: Lets say your client wants you to make the font bigger on all of their buttons on a page, or change the color, you could just edit one, and copy that buttons style and paste all the characteristics of that button (except the event) to others.
I love to copy and paste in skinning! Ahhhhh.