When the recording industry began suing consumers in an effort to scare users of peer-to-peer file trading networks into ceasing their illegal trading of copyrighted songs, the chorus of protest was heard across the country. The RIAA’s move was called draconian, unnecessary, and absurd. But the strategy appears to be working: new site tracking numbers out this week show that usage of the leading file-trading service, Kazaa, is down 41% over the last three months.