adobe photoshop - How to split a PSD that has lots of layer groups

I bought a psd file that has lots of buttons - each button is a layer group.

What's a good way to split the file so that each button is it's own file - with its layers intact. I know how to turn off layers, but the resulting file has too large a Canvas size..(as well as being too big..)

Answer

Awesome mac only app for extracting objects out of a .psd file.

Slicy