Wouldn't it be great to take ear training to the next level so chord changes could be easily recognized and mastered?  Here's an excellent resource for doing just that.  Roberta Radley, from the prestigious Berklee College of Music, provides tools for musicians with a basic knowledge of diatonic chords to improve their listening skills and become better musicians.  The focus of the DVD is to recognize more complex chord progressions quickly and confidently, to listen to music more analytically and to apply this knowledge to all aspects of performance.  This is a real plus for any jazz or pop musician!