How to Save Overly Salty Tapenade
Ideas:


Veer into pesto.  You could add walnuts or pine nuts and basil pesto style.  This would be a good pasta sauce.  I would eat it right now.
Stretch it out with chopped spinach or arugala.
Thin it with cheese.  A dip with your tapenade and feta cheese or a mild blue cheese 50/50 would be dynamite.  Or just with plain yogurt, which is very unsalty.  
Top a pizza with it.