according to him:
August 30th, 2007 at 3:43 pm (Rock) It appears that the rumored Led Zeppelin reunion is not happening.
Fact: The members of Led Zeppelin and Black Sabbath used to jam together back in the 1970s. Rumor: Some of these jams were recorded. I recently asked Tony Iommi about this rumor and he seemed to think the tapes of these jam session could exist. If anyone out there has these tapes, you need to cash in and release them.
http://strigl.wordpress.com/2007/08/30/led-zeppelin/