Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for enhancing search results. In one aspect, a method includes identifying a plurality of registered publishers for enriched search results and, for each registered publisher, obtaining enrichment information from the registered publisher and associating the enrichment information with a resource provided by the publisher. A query is received. A plurality of responsive resources that are responsive to the query are identified. A first responsive resource is determined to be associated with enrichment information. An enriched search result is provided, the enriched search result identifying the first responsive resource and including the first responsive resource's associated enrichment information.