The so-called "Beltway Madam" pleaded not guilty to federal racketeering and money laundering charges in federal court Friday. Prosecutors say Deborah Jean Palfrey, 50, ran a call-girl service in the Washington, D.C. area for 13 years, taking appointments from her California home and dispatching women to luxury hotels in Washington and Baltimore. They say the service promoted prostitution. [Snip] Palfrey, who was indicted last week, is threatening to release her little black book of 10,000 clients on the Internet to pay for her defense. She writes on her Web site that "consideration is being given to selling the entire 46...