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.

CrestaProject

FREE Crest Posts Widget is a simple but powerful WordPress Widget which displays your posts with thumbnail and many other options like the ability to show the date, the number of comments, to change the length of the excerpt, change the size of thumbnails and much more.
Some features:
<ul>
<li>Easy to use interface</li>
<li>Change post title heading tag</li>
<li>Display the date</li>
<li>Display the comments count</li>
<li>Choose thumbnail size</li>
<li>Choose excerpt lenght</li>
<li>Order posts by date, title, comment count and random</li>
<li>Filter posts by category</li>
</ul>

Plugin Homepage 
http://crestaproject.com/downloads/cresta-post-widget/

Cresta Post Widget FREE

Widget for show all posts or filter by category. Many options available including show thumbnail, excerpt, date and comments count.

WP Random Post vs Cresta Post Widget FREE