I am interested in the state of the art with respect to mobile, ubiquitous and pervasive computing. For example, uses of ubiquitous computing in healthcare, business, logistics, context aware mobile business applications, ad-hoc peer-2-peer etc.
What applications have you seen, worked on or maybe read about in research papers that you consider cutting edge examples of these directions in computing? What applications have you seen that you think are really pushing the boundaries?