Modern Grids are moving towards Service-Oriented Architectures (SOAs) to cope with new distributed applications, beyond traditional massive computing for scientific research. Resource sharing across different e-learning domains in a transparent, seamless and secure way, with wireless support, is the goal of the Grid architecture the authors have developed. This paper describes Grid Services which cooperate to perform the above task, including discovery and streaming of multimedia objects, content update, and QoS management. The second part of the paper is devoted to the Peer-to-Peer approach the authors are exploiting to realize a new conception of Grid, where all nodes are potential service providers and contribute to service sharing, discovery and delivery.
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