26. The program product of claim 24 , further operable to cause data processing apparatus to perform operations comprising: identifying the plurality of topics from a corpus of documents.
28. The system of claim 26 , where identifying a plurality of topics comprises: identifying a plurality of n-grams from each document in the corpus of documents; determining an inverse document frequency (IDF) score for each n-gram; and sorting the n-grams by IDF score to identify topics corresponding to one or more of the n-grams.