Im so used to the spam and junk files that I just avoid em. I search mainly for very old music and rare music. so, I somehow usually dont come up with much junk. Gnutella used to be a really good network till the spammers/junk/viruses tookover. Im not sure if theres any real tricks out there to avoid it. I usually just go by the file size and the top search results and reliable sources. T3s and higher are usually the fake hosts that like to flood the network with the crap. I stick with cable to cable dls when I can.