For the last 18 months (or more), people have tried to get me involved wtih Burnlounge, an online music retailer, similar to iTunes, but with a MLM element.
A couple of thoughts, since the Burnlounge people are coming around again...
1. David Jackson of Musicians' Cooler is doing a live podcast on the subject on May 6 at 8pm Eastern. Visit musicianscoolerlive.com to get more information on that.
2. Word is that Burnlounge is no longer charging people to sign up. This could change your change of making money with the program, although I've yet to find a single person who has purchased music from a Burnlounge store.