9. A non-transitory computer-readable storage medium having computer-executable instructions for performing steps comprising: receiving a search query; searching an index for an entry associated with a word in the search query, the index comprising: information pertaining to a document identifier for a spoken document having speech data and text meta-data; a category type identifier identifying at least one of different types of speech data, and speech data relative to text meta-data; and positional information for the word based at least in part on the text meta-data comprising a plurality of words wherein the index comprises position specific posterior lattices and wherein the position specific probability equals one for each of the plurality of words in the text meta-data, the positional information indicating a position of the word in the plurality of words and a probability of the word appearing at the position based upon a summation of the probabilities of a word length along with a word position probability; using the probabilities to rank spoken documents relative to each other; and returning search results based on the ranked spoken documents.
9. A non-transitory computer-readable storage medium having computer-executable instructions for performing steps comprising: receiving a search query; searching an index for an entry associated with a word in the search query, the index comprising: information pertaining to a document identifier for a spoken document having speech data and text meta-data; a category type identifier identifying at least one of different types of speech data, and speech data relative to text meta-data; and positional information for the word based at least in part on the text meta-data comprising a plurality of words wherein the index comprises position specific posterior lattices and wherein the position specific probability equals one for each of the plurality of words in the text meta-data, the positional information indicating a position of the word in the plurality of words and a probability of the word appearing at the position based upon a summation of the probabilities of a word length along with a word position probability; using the probabilities to rank spoken documents relative to each other; and returning search results based on the ranked spoken documents. 14. The computer-readable storage medium of claim 9 wherein using the probabilities to rank the spoken documents comprises calculating a document score as a combination of the category type scores.