Gnutella can never be killed by design. The courts can knock off every other service but never gnutella. It has no central cerver, its some strange filtered peer to peer networking strategy thats not exactly great for those on modems. But with no servers, how can you shut it down? You couldnt even fire its creators, because its under free public license.
And yes, if you knock down napsters server, it appears napigator goes down. I dont quite understand why yet, but napster is blocked here at my school, and we cant get the napigator servers.