8. A computer readable medium having instruction stored thereon that, when executed by one or more computers, causes the one or more computers to perform operations comprising: obtaining aggregate document usage information provided by a plurality of users for a first document wherein the document usage information represents interactions of the plurality of users with a same specific position within the first document wherein the document usage information includes an amount of time that the plurality of users spent accessing the position in the document; receiving a query submitted by a user of a computer system; obtaining search results responsive to the query wherein each search result identifies a respective document and wherein at least one of the search results identifies the first document; ordering the search results based on, at least, the document usage information; and after the ordering, providing the search results to the computer system.
8. A computer readable medium having instruction stored thereon that, when executed by one or more computers, causes the one or more computers to perform operations comprising: obtaining aggregate document usage information provided by a plurality of users for a first document wherein the document usage information represents interactions of the plurality of users with a same specific position within the first document wherein the document usage information includes an amount of time that the plurality of users spent accessing the position in the document; receiving a query submitted by a user of a computer system; obtaining search results responsive to the query wherein each search result identifies a respective document and wherein at least one of the search results identifies the first document; ordering the search results based on, at least, the document usage information; and after the ordering, providing the search results to the computer system. 13. The computer readable medium of claim 8 wherein a rank of the first document in the order is based on, a least, the amount of time.