I said it before, and I'll say it again: Tony Carter's breakout session message "Proclaiming the Comfort of the Gospel" was the absolute best thing I heard at Together 4 the Gospel. It was brilliant, compelling, thrilling proclamation. I don't know if the audio will be made available, but if it is, I highly recommend it to you.
Here is a great snippet of Carter on sin and grace from an Anthem Conference message:
In the T4G message, Carter quoted a bit from Robert Louis Stevenson and turned it into one of the most powerful illustrations in the sermon. In this video he goes with Shakespeare's Macbeth. As a lit-geek, I'm loving that stuff.