13. A computer program product residing on a computer readable medium, the computer program product comprising instructions for causing a processor to: provide a user interface that displays a plurality of representations of characters, the characters each including the representation as a graphic image of an entity corresponding to the character and at least one associated voice model, the voice model characterized by a set of attributes; receive a user selection of one of the representations from the plurality of representations to associate with one or more portions of a sequence of words in an electronic document that is rendered on a user display device; associate the selected character corresponding to the representation with the selected one or more portions of the sequence of words; and modify the voice model associated with the selected character based on data received from the user through the user interface to change one or more attributes of the set of attributes of the voice model.
13. A computer program product residing on a computer readable medium, the computer program product comprising instructions for causing a processor to: provide a user interface that displays a plurality of representations of characters, the characters each including the representation as a graphic image of an entity corresponding to the character and at least one associated voice model, the voice model characterized by a set of attributes; receive a user selection of one of the representations from the plurality of representations to associate with one or more portions of a sequence of words in an electronic document that is rendered on a user display device; associate the selected character corresponding to the representation with the selected one or more portions of the sequence of words; and modify the voice model associated with the selected character based on data received from the user through the user interface to change one or more attributes of the set of attributes of the voice model. 16. The computer program product of claim 13 , further comprising instructions to: generate an audible output corresponding to the one or more portions of a sequence of words using the voice model associated with one or more portions of a sequence of words.