The document discusses the mobile ecosystem, including key players like carriers, manufacturers, developers and users. It notes changing power dynamics with platform providers and developers gaining influence. Different types of mobile users are identified. Mobile trends in 2011 include the rise of apps and mobile fragmentation. The smartphone operating system market share in the US is shown, with Android growing rapidly while Blackberry declined. Worldwide smartphone sales in 2011 are provided, with Android the leader. Various mobile platforms are compared in terms of strengths, weaknesses and other features. User experience is highlighted as important, along with device design, OS usability and app experience. 2011 worldwide tablet sales projections show Android gaining major market share. Manufacturers are categorized as leaders, innovators or assemblers