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.

BelloWeb

AppStore Italy is a plugin that allows you to include URL, price, photos, vote and application category in your page. You can add links to application AppStore using [app #id_application]

AppStore Italia

AppStore Italy is a plugin that allows you to include URL, price, photos, vote and application category in your page. You can add links to application AppStore using [app #id_application]

AppStore Reviews Viewer vs AppStore Italia