19. A method, comprising: performing by a computer: receiving an indication of requested content; analyzing the requested content, wherein said analyzing is based on comparing at least one sequence of one or more phonemes present within audio data of the requested content to a limited number of previously identified phoneme sequences, wherein each of the limited number of previously identified phoneme sequences is associated with one or more of a given collection of advertising files; and matching one of the given collection of advertising files to the requested content, wherein said matching is based on said analyzing.
19. A method, comprising: performing by a computer: receiving an indication of requested content; analyzing the requested content, wherein said analyzing is based on comparing at least one sequence of one or more phonemes present within audio data of the requested content to a limited number of previously identified phoneme sequences, wherein each of the limited number of previously identified phoneme sequences is associated with one or more of a given collection of advertising files; and matching one of the given collection of advertising files to the requested content, wherein said matching is based on said analyzing. 21. The method of claim 19 , wherein the limited number of previously identified phoneme sequences is determined from product category classification schema.