Anjo is cooking up a feast over at his blog :) He's looking at ways of deriving ontologies from weblogs, with some fascinating results so far.

Another add-on might be looking at how to kickstart ontologies from del.icio.us and similar social bookmark systems?

1. You can get mindmaps from delicious
2. You can use mindmaps as a means to kickstart ontologies (e.g. Mind2Onto)
3. So presumably, if you can isolate a targeted group in a social bookmarking system, then you can use the social stuff to kickstart the ontology?