Here's a nice post from Mashable on third party sites that will help you get more out of pinterest. And my favorite is.... wait for it....... PinReach. That's right folks, you knew it was coming. A tool to measure Pinterest influence. I have not tried it out yet as I have just started using Pinterest and don't have enough pins to make it worth measuring yet.
There are also some other non-measurement tools here that will allow you to pin quotes, screenshots and all kinds of nifty stuff.