Spamhaus estimates that by the summer of 2006 spam will account for 95% of all e-mails sent and the problem will not be alleviated until the US acts to toughen its laws.
British anti-spam laws are even more toothlessly useless than the US ones, apparently. 95%? Also according to Spamhaus, Australia has a strong anti-spam law. They report a reduction in overall spam, known spammers are keeping a lower profile, and at least one has left the country.