6. The method according to claim 4 , further comprising causing a display of a first 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.
13. The method according to claim 6 , wherein a dimension of each of the first plurality of tethers is selected based at least in part on the degree of association between the primary item and secondary item corresponding to the node connected to the hub by each of the first plurality of tethers.