Richard J. Cabral, W1RJC writes on SEMARA list:
If anyone is interested, I have the Acushnet Simplex Node connected to IRLP Reflector 9877 which is live NASA Space Shuttle and Mission Control audio. I will leave it connected until at least midnight. All you have to do to listen in is to put your 2m radio or scanner on 146.595 MHz.
More information on the mission is here: http://www.nasa.gov/mission_pages/shuttle/main/index.html