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

jasoncaidev

Check pagerank of your blog pages automatically,display your real pagerank with an icon instantly. 
The pagerank icon is running code from website checker site to generate. 
Visit http://www.websitechecker.info for details.

PageRank Checker

Check pagerank of your blog pages automatically,show your real pagerank.

Kish PR vs PageRank Checker