5. The method according to claim 4 , further comprising: receiving a selection of one of the first plurality of nodes; and causing a display of a second plurality of nodes on the at least one computer display, wherein each of the second plurality of nodes is associated with at least one tertiary item, and wherein a characteristic of each of the second plurality of nodes on the at least one computer display is determined based at least in part on a degree of association between the secondary item associated with the selected node and the at least one tertiary item associated with each of the second plurality of nodes.
5. The method according to claim 4 , further comprising: receiving a selection of one of the first plurality of nodes; and causing a display of a second plurality of nodes on the at least one computer display, wherein each of the second plurality of nodes is associated with at least one tertiary item, and wherein a characteristic of each of the second plurality of nodes on the at least one computer display is determined based at least in part on a degree of association between the secondary item associated with the selected node and the at least one tertiary item associated with each of the second plurality of nodes. 7. The method according to claim 5 , further comprising: causing a display of a first plurality of tethers on the at least one computer display; and causing a display of a second plurality of tethers on the at least one computer display, wherein each of the first plurality of tethers links the hub to one of the first plurality of nodes, and wherein each of the second plurality of tethers links the selected one of the first plurality of nodes to one of the second plurality of nodes.