Apparently someone had some time to kill:

"The other day I had this idea, what if I were to take all the concepts I write, speak, and consult about and turn them into a concept map. That might help me explain how things like messaging, unit of work, and exception management work together and why. It also shouldn’t be too much work. Or so I thought.

I started out with a blank piece of paper, and this is what happened:"

Source: http://www.udidahan.com/2008/08/04/distributed-systems-concept-map/