Hi Tanya - that sounds like an interesting thing you are working on.
What is the message that you/client wants to communicate?
A DEM or TIN would be very odd, then you would interpolate hits in the spaces inbetween your computers. The density of nodes on the network would also be relevant information, wouldn't it?
If you are not satisfied with the bars (which looks ok to me) you might want to look into proportional circles or squares (or spheres).
Could it also be that (physical) space is of less relevance, and it should more be organised in some other space?
If it is peer-to-peer - do you have any information on the relationship between the nodes (how they are connected, traffic), and would that be relevant?
This is a very cool project that I'm working on for a forensic lab. I have received a spreadsheet with 3 columns Latitude, Longitude, and Numbers (number of hits). I'm not getting anymore info than I need to make the map they want! They want to show the number of hits per location, I have no info on how the network is actually connected. So, no interpolation or density info is relevant to this map.
I wanted a graph-like map that was more of a continuous graph, like a DEM. From what I envisioned, what I have looks boring!