1. A method of analyzing digital content, the method comprising: receiving a corpus of text; extracting a plurality of n-grams from the corpus of text; constructing a multi-dimensional document feature vector based on the plurality of n-grams; categorizing a plurality of topics derived from the multi-dimensional document feature vector based on a topic ontology; and generating a hierarchical listing of the plurality of categorized topics that includes a relevancy ranking for at least a portion of the topics included within the hierarchical listing.