A Web forum for Muslim extremists is calling on its members to organize an Islamist hackers' army to carry out Internet attacks against the U.S. government. The site has posted tips, software and links to other resources to help would-be cyber-warriors. The Jamestown Foundation, a District-based nonprofit with a history of extensive ties to the CIA, said that it has monitored postings on a new section of an extremist bulletin board called al-Farooq. According to Jeffrey Poole, a researcher for the foundation, the forum "represents a how-to manual for the disruption and/or destruction of enemy electronic resources, including e-mail, Web...