My biggest problem with voice user interfaces is that everyone can bloody hear you using them! When you type, you can clickety clack, but nobody knows what your clickety clacking means. When you write, and do work by hand, nobody can see what you write unless they're looking over your shoulder. But when you tell your voice-computer: "Create new document, titled 'Reason's why Tom is being fired,'" the whole office will hear you! If they could make a voice computer where you wouldn't have to talk, that'd be a winner.<p>(On a more serious note, maybe some kind of throat mic?)