Continued design. More work to do here. When finished, back to the implementation.
Investigating non-rectangular (and complex 3d) image region selection (use SVG/VML with YUI abstraction?).
Investigating browser tab selection ordering and rendering layers. (YUI OverlayManager manages the z-order of Overlays, but this does not change the tab order as would be desired. Need to modify OverlayManager to re-order document)
Client side rectangular region selection and editing (move, resize) complete.