I bet your window manager can't do this.
(Unless, of course, it happens to be Sawfish.)
The title bar (and the buttons on the right) resize to fit the title, and what's more, the buttons and the resize handles in the corners go away when the window loses focus.
The whole damn window manager is scriptable, not to mention the UI support for customization, and the most powerful bindings editor I have yet to see in a window manager.
(The theme, in case you're wondering, is entirely homegrown using GVim and the GIMP.)
Perfection, I tell you...utter perfection.
Ladies and gentlemen, this one might just be a keeper.