US says it will drop manslaughter case against former Blackwater guard in 2007 Iraq shooting.   Swine flu may be peaking in U.S.   Guidelines for cancer screening differ by group   Researcher: Faint writing seen on Shroud of Turin   Moderate Dems pivotal in Saturday health care vote   N.Y. gold futures scale new closing record of $1,146.80+   SC lawmakers to take up impeachment of governor   Court filings: Accused spy couple to plead guilty   Planes ready to leave Brunswick, Maine Navy base   Court filings: Accused spy couple to plead guilty   Teen pleads guilty in violent Border Patrol murder   Police: NC girl raped, killed on day she was taken   Wis. mulls Harley-Davidson, cheese microbe honors   Floods devastate UK Lake District, much of Ireland   First Air France A380 reaches New York   Tamiflu-resistant swine flu cluster reported in NC   Gates: US to do its part to slow Afghan corruption   Court filing: Cuba spy suspect to plead guilty   Kidnapped Britons say Somali pirates may kill them   Researcher says text proves Shroud of Turin real