Let's suppose we have a monk with two claw attacks.
This character can make a full attack with iterative unarmed strikes using his head, knees, elbows and feet and ears and as long as he does not use his hands he can still make two secondary claw attacks.
Now, this monk takes Beast Strike, the feat from Dragon Magazine.
RAW, nothing says he can't add his claw damage to unarmed strikes made with elbows, buttocks or bellybutton (yeah, the monk class might be weak but it's also cinematically awesome).
So one could add the claw damage to every attack and then still make the two claw attacks?
Or is it like attacking with a weapon, when since you're using your claws to deal damage you can't use them as a natural weapon?