I continue to be very impressed with Simon Cavill of Mi-Pay Ltd. He is the strategy director of a company doing pioneering work in the mobile payments world in Africa. I caught up with him again at Forum Oxford at the end of April 2009 and asked him to give us an update on how the market is developing and the immediate challenges ahead - cash shortages in rural areas and keeping the system secure. As usual, Simon is open and passionate about what they're up to.