Sen. John McCain has been promising that he'll nab Osama bin Laden if elected president. So we have a bit of warning for McCain from the National Counterterrorism Center should the Republican come face to face with the world's most wanted man. Bin Laden, says the center's flashy desk calendar, "should be considered armed and dangerous." Need more? He's left-handed, olive-skinned, stands between 6 foot 4 and 6 foot 6, weighs 160 pounds, and walks with a cane, says the terrorist- packed calendar, available at www.nctc.gov. "As Joe Friday once said," says Carl Kropf, an NCTC spokesman, "just the facts, sir."