Any good file sharing sites for Mac?

I used to download a lot from Napster and Bearshare. Now I see Frostwire and Limewire are available for Mac but according to the reviews -- and this was my experience before I quit using them -- about 85% of the songs listed are actually spam, not music, and lots and lots of viruses. I have no desire to visit the public bath-houses. Are there any alternatives out there?

I'm familiar with Soundcloud, Last.FM and Grooveshark.

Except for safe program updates, I never download files using a browser. Usenet is the safest place to download files, although you still have to watch out for the assholes that frequent the net.