The United States was the 800-pound spam-spewing gorilla throughout 2004, a spot it held from wire to wire throughout the year, an anti-virus firm announced Monday. According to researchers at U.K.-headquartered Sophos, the U.S. accounted for 42.1 percent of the world's spam, more than three times the next-guiltiest nation, South Korea, which launched 13.4 percent of the globe's junk mail. China, Canada, and Brazil rounded out the top five. "When we first reported on the top spamming countries back in February 2004, the U.S. had the excuse that the CAN-SPAM Act had been in existence for a couple of months,"...