I've been thinking about the Toucan interface and I think the icons in the tabs are too big. They're 64x64, larger than the icons in any app I've ever seen, and wind up overpowering the interface. I tried it with 32x32 icons and it looks much better in my opinion:
I also think we should rename the "Portable Variables" tab to just "Variables". That would free up the room to separate out the Help tab from the Settings tab (logically, it makes no sense for help to be on settings). The Help tab could have the about info directly on it with a button to open the help manual.