I did some experiments on how to visualize tag-to-tag relations in a graphic. The result was surprisingly cool.
I wrote a .NET Application that draws the graphic. You can see the result of my climbing blog (www.overhang.at) on http://www.carvedcode.com.
You can also download the Software and create your own Visualization based on the wordpress export xml file.
Have fun with it and tell me how you liked it.