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.

Alex King

Crowd Favorite

A flexible shortcode and lookup tool for creating internal links in post/page content (or anywhere shortcodes are parsed). 
A lookup tool is added to the sidebar of the post edit screen for locating shortcodes for internal posts.
A plugin by <a href="http://crowdfavorite.com" rel="nofollow ugc">Crowd Favorite</a>. We build Big Things with WordPress.

CF Internal Link Shortcode

A flexible shortcode and lookup tool for creating internal links in post/page content (or anywhere shortcodes are parsed).

Permalink Shortcode vs CF Internal Link Shortcode