jowilki

This plugin allows you to display thumbnails and links to yours (or anyones!) latest Pins from Pinterest in your sidebar. It is styled after Pinterest and offers a clean and modern look to show off your pins.
This widget is fully customizable, you can:
<ul>
<li>pull the latest pins from any Pinterest user</li>
<li>display only pins from specific boards</li>
<li>choose the number of pins to display</li>
<li>show or hide the image captions</li>
<li>display a “Follow me on Pinterest” button under your pins</li>
</ul>
Features:
<ul>
<li>Clean and Modern Look (like Pinterest)</li>
<li>Looks great on light and dark backgrounds</li>
<li>Captions scale and look nice with long or short text</li>
<li>Semantic HTML</li>
<li>Easy to Install: Simply add a Pinterest username and you’re good to go!</li>
</ul>
More to come when Pinterest opens their API! This project is maintained on github if you’d like to contribute : 
https://github.com/jowilki/pretty-pinterest-pins

Pretty Pinterest Pins

A plugin to show off images, captions, and links from your latest Pinterest activity.

Mark (podz)

With the SocialMyBlog widget you can easily add social buttons to the sidebar of your blog, and all with one simple widget for all the main social sites, this widget supports many different social sites allowing users to share your blog with thousands of people.

SocialMyBlog

A simple and easily adjustable social plugin for your blog to help you reach more visitors, includes facebook, google+, twitter, pinterest and more.

Pretty Pinterest Pins vs SocialMyBlog