11. A computer-implemented system comprising: a computer-implemented speech recognizer that is configured to (i) receive data that represents a content of a voice query that was orally provided to a computing device, and (ii) generate a textual query that is a textual representation of the data; a carrier phrase database that is programmed to (i) identify a plurality of third-party application programs that are provided by organizations that are different from an organization that provides the system, and (ii) identify a plurality of carrier phrases that have been assigned to respective of the third-party application programs in response to requests by the third-party application programs or providers of the third-party application programs to reserve the respective carrier phrases, wherein the application programs are configured to be installed on the computing device; and a computer-implemented query distributor programmed to (i) identify, in the textual query, a first carrier phrase from the plurality of carrier phrases, and (ii) identify a first third-party application program from the plurality of third-party application programs to which the first carrier phrase has been assigned in the carrier phrase database, so as to cause the query distributor to provide all or some of the textual query for receipt by the first third-party application program.
11. A computer-implemented system comprising: a computer-implemented speech recognizer that is configured to (i) receive data that represents a content of a voice query that was orally provided to a computing device, and (ii) generate a textual query that is a textual representation of the data; a carrier phrase database that is programmed to (i) identify a plurality of third-party application programs that are provided by organizations that are different from an organization that provides the system, and (ii) identify a plurality of carrier phrases that have been assigned to respective of the third-party application programs in response to requests by the third-party application programs or providers of the third-party application programs to reserve the respective carrier phrases, wherein the application programs are configured to be installed on the computing device; and a computer-implemented query distributor programmed to (i) identify, in the textual query, a first carrier phrase from the plurality of carrier phrases, and (ii) identify a first third-party application program from the plurality of third-party application programs to which the first carrier phrase has been assigned in the carrier phrase database, so as to cause the query distributor to provide all or some of the textual query for receipt by the first third-party application program. 18. The system of claim 11 , wherein the speech recognizer generates the first carrier phrase based on a first language model, wherein the speech recognizer selects, based on the first carrier phrase, a second language model from a plurality of language models that are assigned to carrier phrases, and wherein the speech recognizer generates, from the voice query, a remaining portion of the textual query that does not include the carrier phrase, based on use of the second language model.