10. A method for translating a source language to a target language, the method comprising the steps of: providing a weighted letter n-gram file for the source language; providing an aligned file comprising a plurality of source language text strings, each source language text string paired with a target language document; creating an inverted index from the aligned file, the inverted index comprising a listing of unique letter n-grams appearing in the aligned file wherein each listing of a unique letter n-gram in the inverted index is associated with a set of document identifications that point to source language text strings in the aligned file that contain the associated letter n-gram; and retrieving the target language corresponding to the pointed source language.
10. A method for translating a source language to a target language, the method comprising the steps of: providing a weighted letter n-gram file for the source language; providing an aligned file comprising a plurality of source language text strings, each source language text string paired with a target language document; creating an inverted index from the aligned file, the inverted index comprising a listing of unique letter n-grams appearing in the aligned file wherein each listing of a unique letter n-gram in the inverted index is associated with a set of document identifications that point to source language text strings in the aligned file that contain the associated letter n-gram; and retrieving the target language corresponding to the pointed source language. 13. The method of claim 10 wherein the step of creating an inverted index comprises: selecting each source language document from the aligned file in turn; tokenizing the selected source language document to determine each letter n-gram contained therein; filtering the tokenized document to remove letter n-grams not appearing in the weighted n-gram file for the source language; and pairing each letter n-gram remaining in the selected document after the filtering with its associated entropy weight from the weighted letter-n-gram file for the source language.