There is an interesting US report out showing that co-workers sharing digital music in the workplace form impressions based on others’ musical libraries. What’s interesting is not just that this happens, but there’s an awareness of this process. People are consciously shaping what they share in an effort to build a favourable portrait of themselves, even with coworkers they don’t know and don’t interact with that much.
Regarding the IRMA approach, most ISP terms and conditions provide a discretion to the ISP regarding disclosure and a positive obligation on the customer of the ISP not to breach the law when using the service, so it is likely that the ISPs will have a certain amount of discretion as to whether to acede to IRMA’s request. You have to wonder whether it would be a wise marketing move on the ISP, however to “shop” their customers!