Tim Brown is one of the best known proponents of design thinking around, while IDEO, the company he now leads, is probably one of the most-cited examples of a design company that?? embedded itself and its ideas in the business world (current clients include Microsoft, P&G and Pepsi.) A regular attendee of the World Economic Forum in Davos and an advocate for the sustainable design movement (IDEO, remember, is one of the supporters of the Designers Accord), Tim is coming in to BusinessWeek on December 16. He??l answer five reader questions in a video interview. So?? submit your questions below! Please make them snappy (if they??e too long, we??l edit) and please include your location so we can credit you fully. We??l post the video shortly after Tim?? left the building.