Desiring God is doing a series of brief interviews with various teachers called “Theology Refresh.”  John Piper just did two on sanctification.

Part 1 covers sanctification in general.  The progressive nature of becoming more like Jesus, being made more in to His image, becoming more holy in practice.
Listen now or download

Part 2 covers how sanctification works “on the ground;” how it happens in the real world and what role does the gospel plays in our sanctification.  Listen now or download