13. A method of determining a relevancy ranking score, comprising: receiving an indication that a relevancy ranking score algorithm is to be tuned to a selected preference; and updating, using a processor, the relevancy ranking score algorithm based at least in part on the selected preference, wherein the relevancy ranking score of a search result resulting from a search query is based at least in part on one or more constraints of the search query, wherein the relevancy ranking score of the search result is based at least in part on a currency score of the search result, wherein the currency score comprises a score indicating recent results relative to a date of interest associated with the search query, wherein the currency score is based at least in part on a currency function evaluating a date attribute, and wherein updating the relevancy ranking score includes adjusting a peak, a width, and a shape of the currency function, wherein the peak corresponds to a date of interest, wherein the width corresponds to an appropriate time scale width, and wherein the shape of the currency function includes a peaked shape.
13. A method of determining a relevancy ranking score, comprising: receiving an indication that a relevancy ranking score algorithm is to be tuned to a selected preference; and updating, using a processor, the relevancy ranking score algorithm based at least in part on the selected preference, wherein the relevancy ranking score of a search result resulting from a search query is based at least in part on one or more constraints of the search query, wherein the relevancy ranking score of the search result is based at least in part on a currency score of the search result, wherein the currency score comprises a score indicating recent results relative to a date of interest associated with the search query, wherein the currency score is based at least in part on a currency function evaluating a date attribute, and wherein updating the relevancy ranking score includes adjusting a peak, a width, and a shape of the currency function, wherein the peak corresponds to a date of interest, wherein the width corresponds to an appropriate time scale width, and wherein the shape of the currency function includes a peaked shape. 18. The method of claim 13 , wherein updating the relevancy ranking score algorithm includes adding or multiplying by a constant or a function to an element of the relevancy ranking score algorithm.