As unhappy as I am to point this out, I think it needs to be said so hopefully something is eventually done about it.
The most likely hosts to share rubbish on the Gnutella (G1) network are ShareAza hosts. By rubbish files I am referring to files such as such as info, VOB, m3u & torrent files.
Investigating spam via Gnucleus even with a decent blacklist still shows files that are of no use to anybody who downloads such files.
The gnutella network needs good files to be shared (the more the better), but surely there is a method to prevent certain types of files to be shared on a network not suited to them. Easily done IMHO (filter files added to G1 shares), but question is whether the Shareaza devs are willing?