The ACLU will fight it on the legal theory that there will be no consensus possible on what crosses the line from art to porn. I think they are wrong. I think that a system does not have to be perfect, and I would expect websites could be allowed to appeal. I think it would be great, especially for making it easier to write web-browsing filters and protect the youth.
My daughter (who was 11 at the time) and I went online to look for accessories for her MyScene Barbie and when we googled it a whole list of porno sites came up as choices. That really scared me silly.