Come on people. A person using KaZaA does NOT indicate any illegal activities. It allows transfers of all kinds of files: Image, Audio, Video, Text, etc.
I, myself, use KaZaA as it is a very good tool for archival purposes. Many of my old CDs are scratched terribly, so bad they will not play. (You should see my Hootie and the Blowfish: Fairweather Johnson CD. Gash an inch long, and if you want, I'll post a picture...) I also have numerous 8-track tapes, Cassettes, and LP Records (33s and 45s) that I want to archive. I -OWN- these albums, and I have every right under copyright law to download those songs. I can have as many copies of each album as I want "For archival and backup purposes." And yes, this is what I use it for, and so do thousands of others.
Furthermore, I appreciate music videos. KaZaA is one of the best resources for finding videos. And before you start, if it plays on TV, I have the right to download it for 'personal use'. Check your copyright laws, it's legal. It's even legal to copy DVDs and VHS tapes... "For home and personal use only. Distribution, sale, and rental is prohibited."
Third, I make FanVideos. These are freely distributable. Movie + Song -> Themed Video. Share them all you want... [ http://www.animemusicvideos.org/ -> Japanese Animation Based ]
So don't accuse people of using KaZaA for illegal purposes. It's a legal tool, that many people abuse.
And if the spyware bothers you that much... Disable CyDoor. Not really that hard. Ad-Aware -> PhaseShift. Done...