I saw a posted link to a Norweigan site that claimed the authorities where about to stage a big clamp down on filesharers, here it is.
http://www.vg.no/pub/vgart.hbs?artid=117208The story actually mentions a DC++ hub (Stavanger dragon hub) that was seized and the lame attempts to track down the users IPs found on it.
A centralised file sharing network will always suffer from this type of problem.
The ISPs involved have made it clear they will only hand over details when presented with a court order to do so, If at all.