Have you checked out The Gospel Coalition website? I had only once, briefly. But a buddy hipped me to it again last night, and I explored it a bit more thoroughly. Holy cow. The Media section: It's like they put the entire 2007 Conference online.
Videos of the main session messages. Audio of the workshops. Audio of the panel discussions. Audio interviews.
John Piper. D.A. Carson. Mark Driscoll. Ligon Duncan. Tim Keller. Ray Ortlund.
What a great online resource. If you can't reach me, you know where I'll be. :-)