Takashi Fujisaki

It is a WordPress plugin that generates iTunes affiliate links such as iPhone, iPad, Mac apps and music, movies etc.
It is very easy because you can search the application on the article creation screen and paste the Shortcode or HTML tag of the affiliate link (below Applink) .
Applink displays icons, titles, categories, prices, compatible devices, link buttons to stores, and so on.
Also, you can specify the number of screenshots and display it.
Please see the plugin page for details.
<a href="http://e-joint.jp/works/wp-applink/" rel="nofollow ugc">Plugin page</a>
iPhone, iPad, Macのアプリや音楽、映画などiTunes PHGのアフィリエイトリンクを生成するWordPressプラグインです｡
記事作成画面でアプリを検索し､選択したアプリのアフィリエイトリンク（以下Applink）のショートコードまたはHTMLタグをそのまま貼り付けることができますので､非常に簡単です｡
Applinkにはアイコン､タイトル､カテゴリー､価格､対応デバイス､ストアへのリンクボタンなどが表示されます｡
また､スクリーンショットの数も指定して表示させることができます｡
詳しくはプラグインページをご覧ください｡
<a href="http://e-joint.jp/works/wp-applink/" rel="nofollow ugc">プラグインページ</a>
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WP Applink

It is a WordPress plugin that generates iTunes PHG affiliate links such as iPhone, iPad, Mac apps and music, movies etc.

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.

WP Applink vs AppStore Reviews Viewer