Ryan

Permalink Shortcode is a relatively simple plugin that implements a shortcode that you can use to link to existing posts and pages on your site. The shortcode also supports a number of HTML attributes (see below).
While WordPress does include a feature that allows you to link to existing content, this feature only inserts a “static” link. If you were to change the slug for that post or page, previously inserted links would no longer be valid.
The permalink shortcode can be used in two forms:
<ol>
<li>Standard: <code><a href="[permalink wpid='123']">link text</a></code></li>
<li>Enclosing: <code>[permalink wpid="123"]link text[/permalink]</code></li>
</ol>
(Note the single quotes used in the standard form example above. Using double quotes in this situation will not work.)
<h4>Supported Attributes</h4>
The following attributes are available in both the shortcode’s standard form and its enclosing form:
<ul>
<li><code>wpid</code>: The ID number of the post or page to which you want a link.</li>
<li><code>query</code>: The part of a URL that comes after the ‘?’ (e.g. “?foo=bar”). The ‘?’ is optional and will be added automatically if not included.</li>
<li><code>fragment</code>: The part of the URL that comes after the ‘#’ (e.g. “#comments”). The ‘#’ is optional and will be added automatically if not included.</li>
</ul>
The following HTML attributes are available only in the shortcode’s enclosing form:
<ul>
<li><code>accesskey</code></li>
<li><code>charset</code></li>
<li><code>class</code></li>
<li><code>dir</code></li>
<li><code>hreflang</code></li>
<li><code>id</code></li>
<li><code>lang</code></li>
<li><code>media</code></li>
<li><code>rel</code></li>
<li><code>rev</code></li>
<li><code>style</code></li>
<li><code>target</code></li>
<li><code>title</code></li>
<li><code>type</code></li>
</ul>
Things to be aware of with some of the above attributes:
<ul>
<li>In the enclosing form, the CSS class name <code>permalink-shortcode</code> is always added to the <code>class</code> attribute, even if you don’t specify any class names yourself.</li>
<li>In the enclosing form, if no value is given for the <code>title</code> attribute, the post or page title will be used.</li>
</ul>
<h4>Usage Examples</h4>
Simple link (standard form):
<blockquote>
<code><a href="[permalink wpid='123']">link text</a></code>
</blockquote>
Result:
<blockquote>
<code><a href="http://www.example.com/hello-world/">link text</a></code>
</blockquote>
Simple link (enclosing form):
<blockquote>
<code>[permalink wpid="123"]link text[/permalink]</code>
</blockquote>
Result:
<blockquote>
<code><a href="http://www.example.com/hello-world/" class="permalink-shortcode" title="Hello, world!">link text</a></code>
</blockquote>
Linking to the Comments section of a post (standard form):
<blockquote>
<code><a href="[permalink wpid='123']#comments">link text</a></code>
…or…
<code><a href="[permalink wpid='123' fragment='comments']">link text</a></code>
</blockquote>
Result:
<blockquote>
<code><a href="http://www.example.com/hello-world/#comments">link text</a></code>
</blockquote>
Adding a custom CSS class and title (enclosing form):
<blockquote>
<code>[permalink wpid="123" class="my-class" title="Some Other Page"]link text[/permalink]</code>
</blockquote>
Result:
<blockquote>
<code><a href="http://www.example.com/hello-world/" class="permalink-shortcode my-class" title="Some Other Page">link text</a></code>
</blockquote>

Permalink Shortcode

Provides a shortcode that allows you to insert permalinks into your content.

Erick Hitter

Oomph, Inc.

Allows users to point WordPress objects (posts, pages, custom post types) to a URL of their choosing, which is particularly useful for injecting non-WordPress content into loops. The object appears normally in any loop output, but visitors to the object will be redirected to the specified URL. The plugin also allows you to choose the type of redirect, either temporary (302), or permanent (301).
Through a filter, the External Permalinks Redux meta box can easily be added to custom post types. There is also a function available for use with WordPress’ <code>add_meta_box</code> function.
This plugin was originally written for use on WordPress.com VIP. It is inspired by and backwards-compatible with Mark Jaquith’s Page Links To plugin, meaning users can switch between plugins without risk of losing any existing external links.
This plugin is translation-ready.

External Permalinks Redux

Allows you to point WordPress objects (posts, pages, custom post types) to a URL of your choosing.

Permalink Shortcode vs External Permalinks Redux