1. A method for presenting reference information related to content presented on a display, the method comprising: identifying standard and non-standard taxonomy terms in the presented content; compiling a list of standardized taxonomy terms relevant to the presented content based on the identified standard and non-standard taxonomy terms, the non-standard taxonomy terms being mapped to standard taxonomy terms when the non-standard taxonomy terms are synonyms to standard taxonomy terms; determining whether the presented content contains standard taxonomy tags, recognized non-standard taxonomy tags, non-recognized taxonomy tags, or no tags, the recognized non-standard tags being converted to standard taxonomy tags, wherein if the presented content contains non-recognized taxonomy tags or no tags, then the presented content is read to identify any standard taxonomy terms contained in the presented content and add these identified standard taxonomy terms to the list; locating standard taxonomy terms and standard taxonomy tags in a plurality of content files from a plurality of content sources; building indices of the located standard taxonomy terms and standard taxonomy tags for the content files; consolidating the indices into a consolidated index stored on a database, the indices indexing related content from the content sources; searching, unprompted by a user, the indices for related content for at least one of the standard taxonomy terms or standard taxonomy tags retrieving the related content; and displaying the related content.