On the same night that Jon Stewart and Stephen Colbert returned to their shows sans writers, David Letterman, one of two late night hosts with his writing staff, finally shaved off his strike beard. With the help of a barber and a straight razor, Letterman returned from the commercial break with a smooth (if slightly bloodied) face. Also: Letterman guest Mike Huckabee, who graced Leno's first scabby show back from strike hiatus, got the coveted 12:30 a.m. segment, usually reserved for the return from the commercial break after the band plays in order to say goodnight and run credits. Burn?