Arefly

Want some fun in blog?
Like the “I’m Feeling Lucky” Function in Google?
Install this plugin now!
This plugin can Redirect you to the Random post of your blog from a post or a page.
And it is just like “I’m Feeling Lucky”!
<h4>How to use this plugin?</h4>
<ol>
<li>
First install this plugin.
</li>
<li>
Go in to the post/page you want to redirect’s Edit Page.
</li>
<li>
Find Meta Box name “Custom Field”.
</li>
<li>
Click “Enter new”.
</li>
<li>
Enter “random” in Name Table and enter anything in Value Table.
</li>
<li>
Visit this post/page, now you will be redirect to a random post of your blog!
</li>
</ol>
Live Demo: <a href="http://www.arefly.com/try-lucky/" rel="nofollow ugc">Click Here</a> (You will go to a random post of my blog)

WP Random Post

Redirect you to the Random post of your blog from a post or a page.

Xoda

Random Post Box is a plugin that lets you place a box anywhere on your blog, with template tag or shortcode, and 
load random posts with an interval and fade effect. It uses jQuery (Ajax) which means that the content is loaded without 
loading the rest of the page. The timings can be set in the admin options-panel.
The template tag is <code><?php random_post_box(); ?></code>. You can also use the shortcode <code>[random-post-box]</code> in a page or post.
<h4>Features</h4>
<ul>
<li>Insert placeholder with template tag</li>
<li>Insert placeholder with shortcode</li>
<li>Set time for displaying the post</li>
<li>Set times for fade in and fade out affect</li>
<li>Exclude or include posts by category</li>
<li>Exclude posts by age (in days)</li>
<li>Use title only</li>
<li>Use post excerpt or bodycontent</li>
<li>Strip tags from body</li>
<li>Show/hide post metadata</li>
</ul>

Random Post Box

The Random Post Box plugin places a box anywhere on the blog, where it loads random posts one-after-the-other.

WP Random Post vs Random Post Box