1. A system for presenting, to a computer user, reference information related to content being viewed by the computer user, the system comprising: an identification module for identifying taxonomy terms in content being viewed by a computer user, wherein the identification module performs the steps of: (a) determining whether the content contains standard taxonomy tags or recognized non-standard taxonomy tags; and (b) compiling a list comprising standard taxonomy terms relevant to the content; a normalized tag index module, wherein the normalized tag index module performs the steps of: (a) locating words and tags contained in a plurality of content files from a plurality of disparate content sources; (b) building for each of the plurality of content files an index of the located words and tags; and (c) consolidating the built indices into a consolidated index stored on a database; a display upon which related content that is based on the normalized tag index is displayed to the computer user; and a display module that performs the steps of: (a) parsing the content being viewed for a plurality of taxonomy terms; (b) searching a normalized index for at least one of the plurality of taxonomy terms for determining related content; (c) retrieving the related content; and (d) displaying the related content to the computer user.