Metallica - Master of Puppets.
Dare I say, the best in the Metallica catalogue.
I am on a permanent boycott of Metallica. I refuse to listen to a band that would sue their own fans! 
Hey, it's nothing to worry about anymore. If they continue putting out sonic vomit like St. Anger, they won't have to worry about piracy anymore.
Kinda OT from the thread in general, but I thought I'd add something interesting I've recently heard in regards to Metallica and the whole piracy thing.
Lars apparently did an interview recently where he indicates the band was pushed into the whole shutting down Napster situation. I don't remember the actual quote, but he said something to the fact that they were told about the demo for "I, Disappear" being played on the radio while they were still in the studio working on it and being told to go out there and stop it. He doesn't state who would tell them to go and stop it and it sounded more like backtracking from all the negative publicity the band got from it. It's funny though, that they went after Napster because the demo being made available alerted them to the problem, but we've never heard if they ever bothered to go after the source of the demo leak, i.e. whomever was working in their studio. Personally, I feel they're hypocritical SOBs for what they did, especially since the same concept of sharing music between different peoples, i.e. tape-trading, is what got them noticed by a large number of people.
Ironically, in the recent Stuff magazine, Metallica suing fans who were using Napster was ranked #17 in a list of Top Career Killing moves.