I much more prefer to watch talks/conference online, if available. There would be no ads nor some other kind of junk flying over, just scientific bytes from the people who really care about science, and I can work at the same time.
Doing this on TV channel is kind of waist of money and energy. The commercial benifit flowing into the corporated media should be put to some other better place. There are alreadt some popular channel like NASA and discover.