Just had a request by a friend to see if I remembered any software that would allow you to explore relations graphically and drag them around on the screen and see the relations dynamically.
After a bit of digging I remembered where I had seen it before.
It was the old pmbrowser for exploring category research citation chains, and related documents. After a bit more digging around I ran across what looks like the core functionality at http://www.touchgraph.com.
This is useful visualization tools that are provided and available. I'll have to check this TouchGraph out some more when I get a bit of free time again. Especially going to have to explore TouchGraph Google Browser