Grid Computing has succeeded in establishing production Grids serving various user communities all around the world. The emerging Web technologies have already affected Grid development; the latest solutions from peer-topeer networking also need to be considered in order to successfully transform the currently separated production Grids to a World-Wide Grid solving the big problem of Grid Interoperability. This paper gathers the promising peerto- peer technologies and investigates their applicability in current Grids. We state the requirements of a scalable and adaptable high-level brokering architecture, and dene the necessary routing mechanisms that can efciently operate this peer-to-peer Grid meta-brokering architecture.