21. A non-transitory computer storage medium encoded with instructions that when executed by one or more computers cause the one or more computers to perform operations comprising: receiving a search query; providing a structured presentation for display on a display device responsive to the search query, the structured presentation visually presenting information in a systematic and structured arrangement that conforms with a structured design, the structured presentation denoting associations between an instance and values that characterize attributes of an entity corresponding to the instance using an arrangement of the values in respective cells of the structured presentation, wherein one or more values of in the respective cells are populated from one or more electronic documents identified from a search of an unstructured collection of electronic documents; receiving a user interaction with a first cell of the structured presentation, the first cell having a first value for a particular attribute of an instance associated with the first cell; and in response to the received user interaction with the first cell: determining that the first value of the first cell provided in the structured presentations resulted from a prior search of the unstructured collection of electronic documents by a system comprising one or more computers that identified one or more particular electronic documents as including content characterizing the particular attribute of the instance, wherein the first value was determined from the content of the one or more particular electronic documents; and in response to determining that the prior search was conducted, providing information regarding the prior search including providing a search interface associated with the first value of the first cell for presentation on the display device, the search interface configured to present search result information characterizing the prior search including providing information identifying a first electronic document of the particular electronic documents from which the first value for the attribute of the instance was determined including providing for display a link to the first electronic document.
26. The computer storage medium of claim 21 , wherein the operations further comprise updating a display of a value in the first cell of the structured presentation in response to the user interaction.