11. A computer-implemented method for providing orientation into digital information, comprising: maintaining a plurality of evergreen indexes on a server for topically-limited subject areas, each of the subject areas comprising electronically-stored digital information and, for each of the evergreen indexes, comprising: specifying a hierarchy of topics; and pairing a topic model to each of the topics in the topic hierarchy, each of the topic models comprising a pattern evaluable against the digital information, wherein the pattern identifies such digital information matching the topic model's topic; receiving a user interest in the digital information for the subject area of at least one of the evergreen indexes; evaluating each of the patterns for the identified topic models against the digital information; providing access through a visual display to the digital information organized according to each of the topics in the subject area; receiving a query comprising topic search terms and matching the topic search terms to the topics in the topic hierarchy; designating at least one of the chosen topics and the topic search terms as characteristic words; examining all of the evergreen indexes; and identifying those evergreen indexes in the visual display that comprise the characteristic words.
11. A computer-implemented method for providing orientation into digital information, comprising: maintaining a plurality of evergreen indexes on a server for topically-limited subject areas, each of the subject areas comprising electronically-stored digital information and, for each of the evergreen indexes, comprising: specifying a hierarchy of topics; and pairing a topic model to each of the topics in the topic hierarchy, each of the topic models comprising a pattern evaluable against the digital information, wherein the pattern identifies such digital information matching the topic model's topic; receiving a user interest in the digital information for the subject area of at least one of the evergreen indexes; evaluating each of the patterns for the identified topic models against the digital information; providing access through a visual display to the digital information organized according to each of the topics in the subject area; receiving a query comprising topic search terms and matching the topic search terms to the topics in the topic hierarchy; designating at least one of the chosen topics and the topic search terms as characteristic words; examining all of the evergreen indexes; and identifying those evergreen indexes in the visual display that comprise the characteristic words. 14. A method according to claim 11 , further comprising: biasing presentation of the at least one evergreen index based upon the closest matching of the topics to the user interest.