14. One or more tangible computer-readable media storing computer-useable instructions that, when used by a computing device, cause the computing device to perform a method for performing interleaving experiments on blended search results, the method comprising: identifying a plurality of search query categories; for search queries that belong to a first category of search queries of the identified plurality of search query categories, identifying two or more blending algorithms that blend search results produced by two or more ranking systems to generate blended search results; generating two or more sets of the blended search results from the identified two or more blending algorithms; performing the interleaving experiments on the generated two or more sets of the blended search results from the identified two or more blending algorithms to determine an optimal blending algorithm; associating the determined optimal blending algorithm with the first category of search queries: and utilizing the determined optimal blending algorithm to blend search results when a search query in the first category of search queries is received.
14. One or more tangible computer-readable media storing computer-useable instructions that, when used by a computing device, cause the computing device to perform a method for performing interleaving experiments on blended search results, the method comprising: identifying a plurality of search query categories; for search queries that belong to a first category of search queries of the identified plurality of search query categories, identifying two or more blending algorithms that blend search results produced by two or more ranking systems to generate blended search results; generating two or more sets of the blended search results from the identified two or more blending algorithms; performing the interleaving experiments on the generated two or more sets of the blended search results from the identified two or more blending algorithms to determine an optimal blending algorithm; associating the determined optimal blending algorithm with the first category of search queries: and utilizing the determined optimal blending algorithm to blend search results when a search query in the first category of search queries is received. 19. The one or more tangible computer-readable media of claim 14 , wherein one or more of the identified plurality of search query categories describe a subject matter of the search queries in the search query category.