Anti-spam forces must have hit a nerve with their adversaries.
As of the evening of June 7, anti-spam groups Spamhaus, SURBL (Spam URI Realtime Blocklists), URIBL (Realtime URI Blacklist) and others have been <A HREF="http://www.eweek.com/article2/0,1895,2143566,00.asp?kc=EWKNLEDP061107D">under a DDoS (distributed denial of service) attack,</A> according to the ISC (Internet Storm Center), which is run by the SANS Institute (SysAdmin, Audit, Network, Security).
This is an extremely serious issue, as these types of attacks have succeeded in bringing down and, in some cases, permanently knocking out important weapons in the fight against spammers.