[wolco2]

That's where you start. But to make it responsive it takes more work. If I remember..

For a 9x9 basic table grid you would set the width 100% of the top and bottom image do the opposite for the sides and fix the corners. All of these tricks involved choosing designs that could work.

It would have been a tool I would have liked.

[rangelreale]

Also webdesigners loved to change the layout mid-project and it was a big hassle to migrate the slicing from one PSD to another.

Not counting that some websites had dozens of PSD files, it was a pain.