There is a great post over at Loose Change about e-piracy and what can be done about it.
Here's a snippet:
Here’s another myth that needs debunking: Internet Piracy is impossible to prosecute, and no one really tries.
Yes, it’s difficult, and often cost prohibitive, to track down individual posters of one story. That’s not the way our contacts at the US Border Patrol Division of Cyber Crimes work. Cyber crimes cost US businesses millions of dollars a year -- that makes them worth prosecuting. So our trusty Cyber detectives can and do prosecute individuals, including seizing their computers and levying hefty fines, their major point of focus is the host sites that allow Internet users to illegally share files. If sites continually allow users to post illegal files -- music, books, DVDs, etc. -- investigators may well seize servers and prosecute site owners.