Via PCWorld:
The Copyright Alert System is a joint effort by Hollywood studios, record labels and major U.S. Internet service providers to discourage piracy. As laid out in the original memorandum of understanding, ISPs will warn file sharers for repeated offenses with increasingly intrusive messages. For instance, the third and fourth e-mail warnings have read receipts to ensure they were seen by the offender. For warnings that follow, the user may be directed to a special landing page when they open their Web browser or be required to view education materials on copyright.
Imagine a world where Hollywood and the music industry tried to stem piracy by providing content everywhere at a reasonable price instead of pushing for this nonsense.