24. The computer storage medium of claim 19 , wherein the second user interface further displays a subject matter specific user interface element that allows users to select a subject matter specific criteria, or to sort the second search results according to a subject matter specific attribute.
24. The computer storage medium of claim 19 , wherein the second user interface further displays a subject matter specific user interface element that allows users to select a subject matter specific criteria, or to sort the second search results according to a subject matter specific attribute. 25. The computer storage medium of claim 24 , wherein the operations further comprise, in response to receiving a user selection of the subject matter specific user interface element, removing second search results that have attributes which do not satisfy the selected subject matter specific criteria.