17. The computer program product of claim 16 , wherein computer readable program code configured to display a visual representation comprises: computer readable program code configured to display a node to represent each indexed document; and computer readable program code configured to display a connection between a least one pair of nodes, wherein a characteristic of the connection represents a measure of similarity between a pair of indexed documents represented by the pair of nodes.
17. The computer program product of claim 16 , wherein computer readable program code configured to display a visual representation comprises: computer readable program code configured to display a node to represent each indexed document; and computer readable program code configured to display a connection between a least one pair of nodes, wherein a characteristic of the connection represents a measure of similarity between a pair of indexed documents represented by the pair of nodes. 19. The computer program product of claim 17 , wherein: the connection comprises a line; the characteristic of the connection comprises a length of the line; and a first line between a first pair of nodes representing a first pair of documents is shorter than a second line between a second pair of nodes representing a second pair of documents if the first pair of documents are more similar to one another than the second pair of documents are similar to one another.