This is such an interesting project!

I didn't see a way for anyone who wasn't operating their own server to use the service though. It seems like a lot of the quality control / model building power of google has to do with the volume of in bound queries (they're able to see what user satisfaction with results is based on clicks). It seems like having a public facing server that interacted with the peer to peer network might help with adoption from less technical users.

EDIT: Nevermind found this demo portal (http://search.yacy.de/) although it's not very prominent