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

Yatko

statistX PageRank displays the Google (TM) PageRank of your WordPress blog. 
The widget is automatic and can be configured to display different button styles.
Visit <a href="http://pr.statistx.com/pagerank-display.php" rel="nofollow ugc">Free pagerank Display</a> for details.

PageRank

statistX PageRank displays the Google (TM) PageRank of your WordPress blog.

Kish PR vs PageRank