NASA TV HD is now on Youtube (since April 9 2015). Given that most TVs now have Youtube included, this is good news. Here is the link:
Live Streaming ist wegen Rechteproblemen in Deutschland leider nicht möglich.
Yeah! UStream can be pretty dire at times, so that should be fun to try out during live events.
The network also provides an array of live programming, such as 24-hour coverage of Space Shuttle missions