Nice article, this is very relevant to the things I'm working on, as we're trying to come up with a good visualisation for tons of information(literally could be millions), that can then be interacted with.
It is a relationship graph so currently has lots of little squares with titles linking to other squares.
So if anyone has some good links I'm all ears. One interesting link that was stumbled upon in this quest see below. Quite nifty (although very busy), if you ignore all the bouncing that happens.