I'm involved closely with Metamaps project, and am particularly interested in utilizing it as a taxonomy / ontology development and translation tool.
I think it could be quite valuable to explore in the context of Transformap, as a way of surfacing key concepts and relations and defining metadata structures for mapping systems - also potentially down the road as an interface for editing and customizing these structures for various use cases within a larger info-cology.
Metamaps project operates as an open source open value network, and we are interested in partnering / collaborating with peers, projects, and organizations that present mutual development opportunities. Would be glad to discuss in more detail. Currently, most public interaction is on G+ here: