Just heard "Dust My Broom" recorded at the Fillmore East 08/28/70 on Wolfgang's Radio
www.wolfgangsvault.com
It appears as if that is the only track in rotation at the moment, but hopefully they will be adding others and eventually reach back to the Green era shows.
Unfortunately, unlike all of the other tracks I have heard them play, the sound quality was not as clear as I had come to expect...