gilthonwe

This plugin allows you to use the shortcode <code>ios_app_review</code> to embed iOS app reviews and ratings directly into your blog.
What does it do? 
The first time a page with the shortcode is loaded, the plugin will try to download the reviews from Apple’s servers. Then it will store them in a file and nicely display them on your page. 
Every time someone opens the page, instead of downloading the reviews again, the plugin will read them from the cache file. If the cache file is too old, the plugin will try to download new reviews from Apple’s servers.
Check out some examples of what it produces here: http://www.gilthonwe.com (My iOS Apps section)

AppStore Reviews Viewer

Adds a shortcode that displays reviews and ratings of an app from the iOS AppStore’s country you chose.

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.

AppStore Reviews Viewer vs AppStore Lookup for WordPress