RawAlex - I agree... spamming will continue no matter which laws are in place. If it gets to risky doing it from the US, then russian spammers will take over (or another nation)... Its always worth it for someone, thats why I belive that we will all end up with anti spam software - just like most of us have anti virus software in place.
How the software will work - I think a combo of filter, free access lists, paid e-mail access lists will work wonders :-)
If I had the money that some of these big corps are putting into fighting spam, then I´m sure I could get rid of 99.99997% of all the unwanted spam.... who will fund me?