The drawer is such an old paradigm. Apple has moved away from it, I think GrandPerspective should too. The current one is just so big and unresizable using up too many pixels horizontally. I propose a newer iTunes/Finder/iPhoto style sidebar that would be more compact and possibly fit all three tabs into one interface. It could then be resizable and would open inside the window without adding to the overall width rather it would open inward instead of outward like how they work now.