[__void]

Well, windows XP was the peak of gui... only when set to classic mode (like windows millennium)! the plastic edges and colors of XP offered nothing extra to 9x-class interfaces;

the absolute peak of interfaces was mac system 9

[jayd16]

I don't know. I kind of prefer Windows XP as the many-windowed-application style died out by then. Now the only major example I can think of is Gimp.