1. A system comprising: one or more computers; and a computer-readable medium coupled to the one or more computers having instructions stored thereon which, when executed by the one or more computers, cause the one or more computers to perform operations comprising: identifying a candidate term for possible inclusion in a speech recognition dictionary; identifying at least one search query metric associated with the identified candidate term; identifying at least one market data metric associated with the identified candidate term; and generating a candidate term score for the identified candidate term based, at least in part, on a weighted combination of the at least one identified search query metric and the at least one identified market data metric.