NASA Astrobiology hosts many workshops and seminars on this sort of stuff.
In February there was the Habitability of Icy Worlds Workshop.
The recorded presentations are at
http://astrobiology.nasa.gov/seminar...rlds-workshop/
Starting on March 16, there is the Search for Life Beyond the Solar System Conference.
Details and recorded sessions, when available, are at
http://astrobiology.nasa.gov/seminar...em-conference/
Typically the recorded items are posted about an hour after each event.