I would say some of the best times (well they all have been thus far) were the 2 panels. The first panel was with the pastors, John Piper,Tim Keller, Mark Driscoll with Justin Taylor moderating. Here is a clip of the panel. To get the full manuscript, you can at SB’s blog.

Pastors Panel Clip 1

Pastors Panel Clip 2

Pastors Panel Clip 3

Pastors Panel Clip 4