Johan Normark is an archaeologist working with object-oriented ontology, among other ologies. He's goe some interesting stuff at his blog Archaeological Haecceities, which I've just begun exploring. What's interesting is that he's not a philosopher. He's interested in specific stuff, the Maya among others, and is using OOO as a way think about that stuff. So he's working with real examples rather than philosopher's potted examples. Check it out.