User-centered control of quality of service

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As users of the Internet, we have come to expect to receive a large range of services for a flat rate, and to have an ever widening ``data pipe'' allowing us to transfer bigger movies faster. Whether or not such a model makes business sense or theoretical sense is not our point. Rather, we consider that there are still occasions when we will reach the limit of the capacity of the network, if not in the access, then further inside the networks. In such a case, a differentiated-services model can be useful to help more performance-critical applications, but which are the critical applications, and how can they be recognized without breaking the Internet model and giving the ISP control over our environment.