While there are numerous technologies for providing information about resources in a grid environment, none of the current tools provide the complete set of data required for comprehensive grid-enabled Web portals. The goal for GPIR is to aggregate and cache grid and portal related data collected by other technologies (e.g., MDS, NWS, etc.) and make it available via a single tool using standard Web service queries. GPIR also includes some custom providers to provide data not collected by any current grid information system but needed by grid portals and applications developers. GPIR is currently used in production by the TACC User Portal, UTGrid User Portal, and other portals.