On October 20, new royalty fees on webcast music will take effect. These fees were determined by the Copyright Arbitration Royalty Panel. The final rule and order from the Copyright Office were published in the Federal Register on July 8, 2002. Details concerning the rates were published in Appendix A and establish a performance fee, per performance, of 0.07 cents for "simultaneous internet transmissions of over-the-air AM or FM radio broadcasts."
A useful resource on this issue comes from the advocacy group Save Internet Radio, who provide news links, background information, government resources, and identify webcasters who will be impacted by the royalties.