[Alug] P2P Search Engines

(I hope this gets through, I've just installed/configured exim ::grin::) There's a thread on another list I'm on, with regards to the recent google stories on the register, about open source search engines. Has anyone had any experience of any? I notice theres a few about, but none I've heard of. A few people have suggested that a peer to peer search engine might be a good solution (mostly for decentralisation reasons). Does anyone have any thoughts? Good? Bad? Impossible? It's certainly an interesting idea IMO. Might be worth giving it a go to see if it's feasable. BenE