As Mary K. Letourneau leaves prison tomorrow, she faces registering as a Level 2 sex offender, a court order to stay away from the student she was convicted of raping and the renewed glare of media attention from all over the world. .... Letourneau's friends, lawyers involved in the case and officials at the State Department of Corrections say they've been fielding daily telephone calls from the "Today" show, "Oprah," "Primetime," "Inside Edition" -- even a British magazine and television stations in France and Germany. .... And Vili Fualaau -- the former student who fathered two children with Letourneau before...