One of the most succesful chess instruction tools today is the PowerPlay DVD series by GM Daniel King.

All produced over the last 18 months this monument of instructional lucidity now consists of six titles:

PowerPlay 1: Mating Patterns
PowerPlay 2: Attacking the King 
PowerPlay 3: Pawn Storm
PowerPlay 4: Opening Play
PowerPlay 5: Pawn Structures
PowerPlay 6: Positional Play
 
Each DVD has many hours of running time, and as an experienced coach King always includes many well selected test positions. I recommend this series to your attention.