Here are two sites worth wasting a bit of time on, each adopting interesting "plastic visualization" approaches to presenting complex data-rich interrelationships.
Power: Who runs corporate America, and how are they interrelated? There is some fascinating content at They Rule. They Rule plots the boards of directors of American companies, and shows you which other companies those individuals have board seats on. You can drill down into each individual, link to deeper data on the web, and plot interrelationships. They Rule uses some very friendly use of drag-to-place graphics.
Creativity: An interesting way to pull together the different organizations involved in different fields of creativity around the world appears on NGf - Map of Creativity. The interface takes a bit of getting used to, but it is a very efficient way of packing a huge amount of data into a single small space.