paul1999

Instead of embedding a <a href="http://gist.github.com" rel="nofollow ugc">GitHub Gist</a> (a <a href="http://pastie.org/" rel="nofollow ugc">pastie</a> like service on steroids) by copying and pasting HTML you can simple embed it with a [gist] shortcode.
For example, to embed the <a href="http://gist.github.com/30948" rel="nofollow ugc">gist: 30948</a> enter this in a post or page:
<pre><code>[gist id=30948]
</code></pre>
It is that simple.
One problem with gists is that a search engine spiders (and users with javascript disabled) will not see your code in a blog entry. This plugin allows you to get around this by including text, such as content of the gist inside the shortcode. The text is wrapped inside these tags:
<pre><code><noscript><code class="gist"><pre>
</code></pre>
You would use it like this:
<pre><code>[gist id=30948]
puts hello_world_test;
i = 0
5.times do
 i = i + 1
 puts i
end
[/gist]
</code></pre>
The content inside a gist shortcode is optional.
View the <a href="http://svn.wp-plugins.org/github-gist-shortcode/trunk/CHANGELOG" rel="nofollow ugc">CHANGELOG</a> to see what has changed between versions.

GitHub Gist Shortcode Plugin

Allows the use of a simple shortcode to embed GitHub Gists in a post or page.

dflydev

This project is available for forking on GitHub:
<ul>
<li>https://github.com/dflydev/embed-github-gist</li>
</ul>
Embed <a href="http://github.com/" rel="nofollow ugc">GitHub</a> <a href="http://gist.github.com" rel="nofollow ugc">Gists</a> into 
WordPress. Provides a shortcode for posts and pages but also has the ability 
to embed by hand in the event that a Gist needs to be embedded somewhere in 
the page that does not pass through the shortcode filters.
Examples:
<pre><code>[gist id=546764]
[gist id=546764 file=file.txt]
[gist id=546764 file=file.txt bump=1]
[gist]http://gist.github.com/546764[/gist]
</code></pre>
Cache is implemented with the Transients API to minimize delay on loading 
content. Default TTL (time to live) is 86400 seconds or one day.
<h4>Upcoming features:</h4>
<ul>
<li>Option for setting default TTL</li>
<li>Option to bypass cache entirely</li>
<li>Implement admin interface to control options</li>
</ul>

GitHub Gist Shortcode Plugin vs Embed GitHub Gist