In small bowl, combine the first seven ingredients. Pour 2/3 cup into large resealable plastic bag, add salmon, seal bag and turn to coat. Refrigerate for at least 2 hours. Cover and refrigerate remaining marinade for basting.
Coat grill rack with nonstick cooking spray before starting grill. Arrange lemon slices on rack. Drain and discard marinade.
Place each salmon fillet over two lemon slices.
Grill, covered, over medium heat for 5 minutes. Brush with some of the reserved marinade. Grill 10-15 minutes longer or until fish flakes easily with a fork, basting occasionally with remaining marinade.