Today at 6 P.M. EDT, NASA will begin broadcasting Mars Pheonix Lander's final descent to the surface of the red planet. As of posting the Lander is still on target and due for touchdown at approximately 7:53 P.M. EDT. The first images it sends back will also be broadcast live.
Catch the live feed at: http://www.nasa.gov/multimedia/nasatv/index.html
or on Digital NASA Television via Satellite
In the continental United States, NASA Television's Public, Education and Media channels are carried by MPEG-2 digital C-band signal on AMC-6, at 72 degrees west longitude, Transponder 17C, 4040 MHz, vertical polarization. They're available in Alaska and Hawaii on an MPEG-2 digital C-band signal accessed via satellite AMC-7, transponder 18C, 137 degrees west longitude, 4060 MHz, vertical polarization. A Digital Video Broadcast compliant Integrated Receiver Decoder is required for reception. Analog NASA TV is no longer available.
For more information on the Pheonix Lander check out NASA's Offical Site.