jcatcw writes "From Xerox PARC to Apple to Microsoft, the GUI has been evolving over the years, and the increased complexity of current systems means it will continue to change. For example, Microsoft is switching from dropdown menus to contextual ribbons. Mobile computing creates new demands for efficient presentation while the desktop GUI doesn't scale to larger screens. Dual-mode user interfaces may show up first on PDA phones but then migrate to laptops and desktops. Which of today's innovations will become tomorrow's gaffs?"