Limewire just got their lawsuit as did Kazaa a while back, according to Yahoo news. I hope you like your 'free' music cause it won't last!
As much as I agree with 'file sharing' I disagree with programs like this. Bit Torrent on the other hand, has gone about it the right way, just as Napster has now become a legal source for music downloads, you can find the right program that does the right job, just ask!
Personally, at the current pricing structure that Napster has (available in Canada as well), at around the price of purchasing less then one cd from a music store, you have no reason to give your computer a virus by file sharing.