Back Exercises

Exercises affecting primarily back thickness

Barbell Bent-Over Row (use an underhand grip for more bicep emphasis)
Pendlay Row
Cable seated row

Exercises affecting primarily back width

Pullups (or assisted pullups) - Tina Todd
Narrow Grip Pullups (or assisted narrow grip pullups)
Lat Pulldown Wide Grip (Front)
Lat Pulldown Close Grip (Front)
Dumbbell Pullover 
Yates Row
Cable Pullovers (also great for abs)