I'm looking for something that will let me organize different types of network information into layers, and to display (or not) those layers depending on the zoom level of the viewer. So if you zoom out all the way, you see WAN links between sites, but if you zoom in to a particular node, you see MAC addresses and kernel versions (or whatever).

This would work in much the way that Google Earth decides to display information depending on the viewer's altitude or distance from the geographical feature.