15. A computer-recordable device storing computer program instructions for providing expressive user interaction with a multimodal application, the multimodal application operating in a multimodal browser on a multimodal device supporting multiple modes of user interaction including a voice mode and one or more non-voice modes, the multimodal application operatively coupled to a speech engine through a VoiceXML interpreter, wherein the computer program instructions, when executed, cause performance of a method comprising: receiving, by the multimodal browser, user input from a user through a particular mode of user interaction; determining, by the multimodal browser, user output for the user in dependence upon the user input; determining, by the multimodal browser, a style for the user output in dependence upon the user input, the style specifying expressive output characteristics for at least one other mode of user interaction; and rendering, by the multimodal browser, the user output in dependence upon the style, wherein determining the style for the user output in dependence upon the user input comprises performing a determination distinct from determining the user output, wherein determining, by the multimodal browser, a style for the user output in dependence upon the user input comprises determining, by the multimodal browser, a style for the user output in dependence upon meaning of the user input.
15. A computer-recordable device storing computer program instructions for providing expressive user interaction with a multimodal application, the multimodal application operating in a multimodal browser on a multimodal device supporting multiple modes of user interaction including a voice mode and one or more non-voice modes, the multimodal application operatively coupled to a speech engine through a VoiceXML interpreter, wherein the computer program instructions, when executed, cause performance of a method comprising: receiving, by the multimodal browser, user input from a user through a particular mode of user interaction; determining, by the multimodal browser, user output for the user in dependence upon the user input; determining, by the multimodal browser, a style for the user output in dependence upon the user input, the style specifying expressive output characteristics for at least one other mode of user interaction; and rendering, by the multimodal browser, the user output in dependence upon the style, wherein determining the style for the user output in dependence upon the user input comprises performing a determination distinct from determining the user output, wherein determining, by the multimodal browser, a style for the user output in dependence upon the user input comprises determining, by the multimodal browser, a style for the user output in dependence upon meaning of the user input. 19. The computer-recordable device of claim 15 wherein: the style specifies prosody for the voice mode of user interaction; rendering, by the multimodal browser, the user output in dependence upon the style further comprises: synthesizing, through the VoiceXML interpreter using the speech engine, the user output into synthesized speech in dependence upon the style, and playing the synthesized speech for the user; and the method further comprises providing, by the speech engine to the multimodal browser through the VoiceXML interpreter, a prosody event in dependence upon the synthesizing of the user output into synthesized speech.