I'll work on getting slices into the .psd's so you'll have the images done so far in no time. Cutting isn't that good in the view of updating the graphics from time to time, and some stuff need layer handling so making screenies would be a drag.
The buttons will be named NameOfButton.n/o/p.png depending on Normal/Over/Pressed (those are the output settings I have now so I'll use those).

One question; how will the taskbar autosizeing work with draggable sections. If the ections would form a simple bar then it would resize to the current screen width minus the other sections widths. Will it have a fixed width if dragged away? Not neccesary for me to know but I'm curious. Would be nice if it had the width it had docked but the user could dragg it's width like a normal window.