1. A method for using a computer system, in response to a reader's request for display of electronic text, to automatically identify and provide additional reading material related to concepts referred to within said electronic text comprising, in sequence, the steps of: a) on a client system, a.1. accepting a request for display of electronic text; a.2. sending said request for display of electronic text over a network; a.3. receiving said electronic text, said electronic text containing at least one text section; and a.4. without further user input, sending a search request over said network, from said client system, for additional information related to a concept referred to in said at least one text section; and b) on a server system, responsive to step (a.4) b.1. searching an index, wherein i) said index contains a plurality of terms by which it may be searched; ii) substantially all terms in said index are associated with at least one pointer to a text section; and iii) at least one term in said index is associated with a plurality of pointers, at least two of said plurality of pointers pointing to different text sections; b.2. as a result of step (b.1), identifying additional reading material related to said concept; and b.3. providing, via the network, to said client system, for display on the same page as a portion of the electronic text section referred to in step (a.3), an indicator of said additional reading material identified in step (b.2).
18. The method of claim 1 , wherein said indicator of additional reading material comprises an excerpt of said additional reading material.