Interesting piece in the New York Times about how spam could be greatly reduced, if the credit card companies could block the merchant accounts of the spammers, 95% of which go through three banks. If the spammers tried to dodge these efforts, it would take longer for them to set up new accounts than it would to shut them down as soon as they were identified as spam.

http://www.nytimes.com/2011/05/20/te...sq=spam&st=cse