PPeelen

This plugin lets you add your app’s position on the appstore to your blog. Simple add the Apple ID, select genre and range and your on the go.

Itunes AppStore App Ranking

This plugin lets you add your app's position on the appstore to your blog. Simple add the Apple ID, select genre and range and your on the go.

Adam D

The AppStore Lookup is a simple WordPress plugin that provides shortcodes for querying Apple’s Lookup API to get app data from iTunes or the Mac AppStore. You can modify it as you wish, or use the built-in options to make it fit the needs of your site.
Features:
<ul>
<li>Lookup and display data from Mac App Store and iPhone/iPad App Store</li>
<li>Display App icons</li>
<li>Display App screenshots</li>
<li>Up-to-date app ratings information</li>
<li>Add Smart App Banners for iOS mobile Safari</li>
<li>Use your Linkshare ID for download links and Smart App Banners</li>
</ul>
<a href="http://adamdionne.com" rel="nofollow ugc">Support</a>

AppStore Lookup for WordPress

Adds shortcodes that display data from iOS and Mac AppStore applications.

Itunes AppStore App Ranking vs AppStore Lookup for WordPress