File sharing is very common obviously on the net.

The only answer I have discovered is to see "reasonable" filing sharing as a sort of advertising and to try to work out a way to capitalise on it. I think the trick is to try and use it rather than spend ALL the time fighting it. Not talking about serious abuse of your copywrite of course.

The way to get to the possible punters that may want your stuff on their ipod is to blog on the same site that the original blogger was on.

If you give away some tracks free they will soon come to you

I have had very good experience with CDBaby and their non exclusive digital distribution (Not that I sell a lot!!!! just they have been good to deal with) so that is a route that I can recommend.

Other possibility is to look at a creative commons type license that gives people to permission to copy BUT NOT TO SELL.