Via Alexander Popescu’s MyNoSQL blog.
Compelling examination of how Redis works. Some the diagrams are look a lot like diagramming subjects and relationships between them.
Take a look and judge for yourself.
Suggests 1,002 uses for topic maps doesn’t it?
Anyway, if you want to get into the internals of Redis, either for the sheer discipline of it or because you think it may figure in your topic map future, here is a good place to start.