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.

Ste-Bi

Use this Plugin if you are tired in changing URLs and prices on every Link to the AppStore on your page. This plugin updates all Data directly from the Apple Server. You also can setup caching-times for images and the content. If you have an PHG-ID the plugin automatically creates Affiliate Links to the AppStore.
You can easily add Links to the Apple AppStore with using [app ##idnumber##] in your posts, pages or comments. The ID number is the number from the official AppStore URL.
<ul>
<li>[appimg ##idnumber##] gives you the screenshots!</li>
<li>[appext ##idnumber##] gives you info, screenshots and a nice border.</li>
<li>BETA (use with care): You can use something like: [app 307658513]Developer:{trackname} 
Price:{price} {dllink} 
[/app]</li>
<li>With these tags: {trackname}, {sellername}, {dllink}, {price}, {stars}, {description}, {artwork100}, {artwork60} 
You can follow us for news on Twitter: http://twitter.com/AppStore_plugin</li>
</ul>

AppStore Links

Plugin for easy linking to (Mac) AppStore Apps. You can use the PGH-ID for automatically creating Affiliate-Links

AppStore Reviews Viewer vs AppStore Links