Kishore

This plugin is using Google Pagerank API to fetch the Google Pagerank of any webpage and the pages of your blog Features
<ol>
<li>Display page rank of you blog</li>
<li>Give your visitors a tool to check pagerank</li>
<li>Simple installation</li>
<li>Ajax based Pagerank checker</li>
</ol>

Kish PR

A plugin to check Pagerank of any website or webpage. Display pagerank of your blog pages

viperchill

ViperProof allows you to show various aspects of social proof on your website, which will help you to get more blog subscribers. It allows you to show the number of: Facebook Fans, Twitter Followers, Blog Posts, Blog Comments and Monthly site visitors.
<a href="http://www.viperchill.com/" rel="nofollow ugc">ViperChill</a>, a blog on Viral Marketing, is the creator of this plugin. If you want to take your blog to the next level, you should read this post on <a href="http://www.viperchill.com/wordpress-seo/" rel="nofollow ugc">WordPress SEO</a>.

ViperProof

ViperProof allows you to show various aspects of social proof on your website, which will help you to get more blog subscribers.

Kish PR vs ViperProof