Significant effort is invested towards creating innovative applications for the emerging Smart Grid. However, many of these efforts use the old modus operandi of the energy domain providers i.e. offer of a monolithic application residing on proprietary or provider-only data, with little thought about cross-application collaboration and information exchange. However, the future of Smart Grid applications resides on sophisticated multi-channel applications that can rely on multi-source data and Internet provided basic services that can be easily customized for the specific end-user groups. Such a web application for monitoring and managing a Smart Grid neighborhood, where real-time energy monitoring, prediction and management of energy trading takes place, has been realized and piloted. We present here some of the key functionalities, as well as an assessment of the application and its design decisions.