Spurious search results need to be dealt with by ultrapeers rejecting them, not by end users blocking hosts. Blocking the spammers is a band-aid -- they've shown themselves able to move around and acquire a lot of network addresses -- somehow -- and anyway, the bogus results compete with legitimate results for limited network bandwidth. Ultrapeers need to start doing some sort of automated bitzi lookup or something, and when they have to pass on only a subset of the search results they've received, they can then dump the n lowest-rated results. So when search results get dropped, the spam will get dropped first.