The man had a lot to say and he knew exactly how to say it. Ali Rap,       based on a book by George Lois, highlights the witticisms, rhymes, insults,      and jibes that established Muhammad Ali as somewhat of a precursor to hip hop.   Originally airing on ESPN, this uproarious, inspiring program follows Ali from his early days of shamelessly promoting himself, Cassius Clay, up through the  time he became a beloved American hero, known by all as "The Greatest." Hosted by Chuck D and featuring Sylvester Stallone, James Earl Jones, Sydney Poitier,   Ludacris, Reverend Al Sharpton, Kareem Abdul-Jabbar, Adam Corolla, Diane       Sawyer, Rakim, Doug E. Fresh, and many others.                                 USA---2006---44 mins.