Audio from the 2008 Soil Association Conference is online:
http://www.soilassociation.org/conference
Rob Hopkins has written up a report of the event:
http://transitionculture.org/2008/12/02/a-write-up...
So far I have only listened to the opening talk by MEP Caroline Lucas and it addresses peak oil and climate change.
Their 2007 audio is also linked from the page above and this also has lots of good looking audio.