Thanks very much, Clement.
I see what you mean. Are you aware of software (like Net 2 Table) or a function in excel that creates relationships automatically between nodes (e.g., columns)? Or perhaps a Gephi plugin for this?
Have you worked with TouchGraph? It's another network graph software package, except it's not open source, there's no community, it's way over priced and it's not as flexibility or scalable as Gephi
However, it has one very useful feature that I can't seem to find with Gephi - it allows you to create edges for your nodes by simply relating node types together (not individually and you don't have to set up the edges in your spreadsheet beforehand - you just need columns of possible nodes).
check it out: http://www.youtube.com/watch?v=OCzK-EAcCUQ#at=211
Interested in hearing your thoughts.