Becouse there is...
You deal unarmed damage on a sucsesful grapple attempt. You can Pin in two successes (one to initiate graple, one to pin). You can leave a graple if you are pinning as a free action. Player Hand Book v3.5 p 155-7.
there is also a feat in Races of Stone called fling enemy. You pick up an ememy smaller than you and trow them, just like a giant throws a rock. But this isn't quite what you where after, was it?