When, and on what channel(s) will the Olympic's opening ceremony be
rebroadcast, USA, EST?

According to the schedule in my morning newspaper, the opening
ceremonies are being rebroadcast on NBC's digital signal (in HDTV) all
day today (Saturday).  This signal is accessible to those with a
digital TV set in most markets either over the air (with an
appropriate antenna) or with a digital cable subscription. 
Presumably, it will also be available in some public places.

Thanks Mark. I was hoping there would be something on an analog
channel. I have basic Comcast CATV out of Phila (Philadelphia network
affiliates) but I don't have HDTV (yet)or their extended channel line
up, or digital service, as they call it at Comcast. I do have
Dishnetwork, (Echostar) satellite. My local network channels come out
of New York on the satellite. I subscribe to almost every channel that
Dishnetwork has.