StellarBay.com News reports: "Utah and Michigan are the first two states to have both passed the legislation which is aimed at minors having access to otherwise unwanted, sexually explicit or violent electronic communications."
A 'do not contact e-mail and instant messenger address' list, makes as much sense as creating a 'do not rob list' to tell thieves not to rob your homes or businesses. The original 'do not call list' made a great deal of sense because most telemarketers are legitimate businesses that have to obey the law. I believe that 99% of spammers are probably not a legitimate business, so they don't have to answer to the law unless they're caught.
If you read the article the law looks like it has holes in it big enough to drive a large truck through. This law is a good idea, but bad in execution. I really believe this law can create more problems then it can correct. Its not that Utah and Michigan did a bad job in writing the law, just the problem its trying to address is very difficult legislate, prosecute and enforce.