My wife runs a craft blog and gets almost 2k a month in traffic from pinterest. The traffic coming in seems to do really well in terms of purchasing things from her site.She also uses craftgawker which has been HUGE in terms of targeted traffic to her blog.
With Pinterest, you need to be mindful of the trending images and topics, just like twitter. Sit and watch what is going on there. If your company doesn't naturally fit in there, I wouldn't worry about using it. You will end up wasting time and resources trying to crack the "pinterest code".
I would look at the categories that pinterest has listed on their site and if you don't fit in, then move on. Pinterest is amazing, don't get me wrong. I wish I was ben or paul or any of them! But I wouldn't get too wrapped up in using pinterest just because everyone else will. In a way I feel sorry for pinterest. What made them great when I first started using it was how uncluttered it was with terrible stuff. Sort of like twitter in the beginning. Now that more and more people are talking about it in a marketing way, I can already tell it is heading down the twitter path.
Pinterest is great for companies who want to contribute without a huge expectation of anything in return.
This was totally unhelpful and I apologize