Forum Moderators: phranque
But I wouldn't try and discourage people from downloading them - it's so negative and will turn people away from you immediately.
So that's an approach I'd recommend, letting people have one or two of your songs. Iguana's suggestion to include your website info in the mp3s information is crucial.
But I can see how you might not want to just give your stuff away. I don't have much to offer on the technical aspects of streaming mp3s, but an approach I've seen on the websites of more commercially-successful bands has been to simply offer short clips for streaming or downloading. That's another option.
Good luck!