link to Superman panel audio
The link takes a little time to load or it did for me.
Found this audio on bleedingcool.com from the panel with Mark Waid and author Larry Tye, who wrote a recently published biography on Superman.
If you are a Superman fan, I can't imagine you not enjoying this. Waid kind of dominates the panel he was supposed to moderate, but there's a lot of fun info on there. A lot of it you may have heard or read before, but Waid shines a bit of a different light on how Siegle/Shuster profited off Superman in the '40s.
The panel made me want to buy Tye's book. Don't let the length of the panel deter you, it flew by for me. I wanted to hear more.