Last week’s Saturday Night Live, with Justin Timberlake making his fifth appearance as host, easily was the best installment of the season – and this cut-down, prime-time "instant" rerun ought to be even better, if NBC cuts the weakest two skits. But boy, did the show start strong, with Timberlake joining the ultra-exclusive “Five-timers” club – and sharing drinks with Tom Hanks, Alec Baldwin, and others. Later tonight, in the regular SNL time sot, there’s ano