I’m looking for something to apply a self-organised map to. The only thing that I can come up with at the moment is organising items from e.g. EQ (or any other game where I can get a hold of a dump of the items) into clusters so that one can navigate from one item to other similar items.

It seems like I’m often returning to MMORPGs for vast amounts of data to experiment with, there must exist other sources of interesting data that are easy to tap.