In the past few days, several tech industry giants have proposed a new schemes for tackling the growing problem of spam.  Companies like Microsoft, Yahoo, and HP are developing proposals that include measures like email stamps, address authentication, and modifications to the traditional SMTP.  According to a recent article in The Guardian, spam currently accounts for up to 70% of all email traffic, and the numbers continue to grow.  The Berkman Center's John Palfrey offered a different response to the spam problem in a paper recently presented to the ITU's Workshop on Internet Governance, "The Accountable Net," based on previous collaboration with David Johnson and Susan Crawford.