As part of the dissemination activities of the SeLeNe project, a workshop entitled "Metadata Management in GRID and Peer-to-Peer Systems" was held in London on December 16th 2003. The workshop contained sessions on metadata management in GRID systems, metadata management in P2P systems, and two sessions on applications where metadata management is critical. The final session included a presentation of the SeLeNe project and its key achievements. This deliverable contains a report on the MMGPS workshop. It begins by introducing the aims of the workshop, then gives a detailed account of the presentations in each session, and finally summarises the overall conclusions from the workshop. The deliverable ends with a section highlighting the key transferable outcomes of the SeLeNe project, and how these can be accessed and exploited by interested parties.