Have you looking for a all in one ranking button to show your blog ranking without checking it manually, i think Showoff Rankings plugin it the one you are looking for!

What is Showoff Rankings
Showoff Rankings plugin for WordPress shows the rank buttons for Google’s PageRank, Alexa, and Technorati as shown to the left. It provides a simple and elegant representation of your blog’s rankings. Currently supported rankings are: Google PageRank, Alexa Traffic Ranking, Technorati Rank, and several aspects of the plug-in can be customized (see sidebar for an example):
showof_rankings_plugin

There is not a WP plugin, but a normal javascript that you can enter in your blog. Create your own raking siebar now!

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