I've been using TouchGraph's Google browser for many years just as an initial web site research tool. It's immensely useful to see what the key relationships are of at least the web entity of an organisation. This tool also provides an indication of strength of relationship. It's not always accurate but they've enhanced the user experience that is significantly better than the previous version.
Here's a screen grab of my book web site
And here's one of this blog.
A visual web is being spun. Try out the BBC (who seem surrounded by neocon media giants) and Al Gore's ClimateCrisis web site (plugged into the grass roots).