[beloch]

Also worth noting:

The more effort the ISP's put into this initiative the more it costs them in terms of labor and upset customers. It therefore seems pretty obvious that the optimal solution for an ISP is to join the program but put in the minimum effort possible.

I predict that file-sharing tools will evolve much faster than the ISPs' half-hearted anti-piracy efforts. The result will be a lot like the RIAA lawsuits of the last few years. Occasionally someone will get unlucky, but the odds of getting caught will be so low that pirates will not be deterred to any significant degree. The only real result will be continued ill-will towards publishers, which will probably result in a net boost to piracy rates.