7. A system for comparing content overlap between electronic documents, the system comprising: a server node in electronic communication with a user interface node and one or more electronic databases, the server node being configured to: receive a search request from a user for documents containing one or more keywords; access the one or more electronic databases and present to the user a first list of one or more documents in the one or more electronic databases based on the one or more keywords, the first list of one or more documents including a first hyperlink for the first electronic document; receive from the user a request for the first electronic document via the first hyperlink; determine, in response to the request for the first electronic document, a second list of documents in the one or more electronic databases that are similar to the first electronic document, the second list of documents including the second electronic document, and wherein to determine the second list of documents the server node is configured to: parse a text of each of the first and second documents into constituent units; compute a digest of each of the first and second documents, compare the computed digests; compute a proportion of common contents between the first and second documents and a proportion of distinct contents between the first and second documents based on the comparison; determine a date associated with the first document and a date associated with the second document; determine a direction of borrowing based on the determined dates; and display to the user the contents of the first electronic document and a hyperlink to the second electronic document and a graphic indicating the direction of borrowing between the first and second documents, wherein the indication of borrowing direction between the first document and the second document is displayed as an arrow oriented to point in the borrowing direction showing a computed direction of flow of the information from a donor document to a borrower document, and wherein the graphic comprises a measure of relationship overlap between the first document and at least one of the second document and a selected portion of the second document.
7. A system for comparing content overlap between electronic documents, the system comprising: a server node in electronic communication with a user interface node and one or more electronic databases, the server node being configured to: receive a search request from a user for documents containing one or more keywords; access the one or more electronic databases and present to the user a first list of one or more documents in the one or more electronic databases based on the one or more keywords, the first list of one or more documents including a first hyperlink for the first electronic document; receive from the user a request for the first electronic document via the first hyperlink; determine, in response to the request for the first electronic document, a second list of documents in the one or more electronic databases that are similar to the first electronic document, the second list of documents including the second electronic document, and wherein to determine the second list of documents the server node is configured to: parse a text of each of the first and second documents into constituent units; compute a digest of each of the first and second documents, compare the computed digests; compute a proportion of common contents between the first and second documents and a proportion of distinct contents between the first and second documents based on the comparison; determine a date associated with the first document and a date associated with the second document; determine a direction of borrowing based on the determined dates; and display to the user the contents of the first electronic document and a hyperlink to the second electronic document and a graphic indicating the direction of borrowing between the first and second documents, wherein the indication of borrowing direction between the first document and the second document is displayed as an arrow oriented to point in the borrowing direction showing a computed direction of flow of the information from a donor document to a borrower document, and wherein the graphic comprises a measure of relationship overlap between the first document and at least one of the second document and a selected portion of the second document. 8. The system of claim 7 , wherein the graphic further comprises an indication of the proportion of common contents and an indication of the proportion of distinct contents.