An interesting example of concept map showing the relationships among Wired Magazine contents.

In other words:

The Wired mind is a visualisation tool that provides another way to browse the content on Wired.co.uk. It’s been created in partnership with Microsoft’s Internet Explorer 9 browser to show off some of the great things you can do with a really fast standards-based browser. You can explore the Wired Mind by searching for tags, or by seeing the most popular tags on a particular date.

Even though it’s optimised for IE9, it works on other browsers (but very slowly) as well.