I’ve been reading up on a variety of projects whilst here in the UK. One I found particularly interesting is the IBM History Flow research project.
The project is part of the collaborative user experience research group here and aims to visualise the relation of document change. It is currently aiming to visualise changes of documents, by analysing the wiki site, Wikipedia. Some of the results are quite interesting.
A similar project is that of the Latex Wiki which also indexes and visualises relationships of document changes.