For those who missed the Nimoy episode, according to the Biography Channel, it will be re-aired at the following days/times:
Tue January 13, 2009 @ 10:30 PM
Wed January 14 2009 @ 2:30 AM & 11 PM
Thu January 15 2009 @ 3:00 AM
It doesn't specify but I am guessing all times are EST.