Four Nodes

Simple plugin to display random posts on your wordpress blog. Plugin provides a widget to display random posts in sidebar. 
Also comes with a shortcode [randomposts] to include on pages.
<ul>
<li>Easy to install</li>
<li>Picks Random Posts</li>
<li>Ability to select from specific category</li>
<li>Limit number of posts</li>
<li>Shortcode support</li>
</ul>

FourNodes Random Post

Displays Random wordpress posts in a sidebar widget. Also, provides shortcode to display random posts on pages.

Tired of boring lists of recent posts?
Taking advantage of the date to color algorithm used in the <a href="http://www.ikirudesign.com/themes/kaleidoscope/" title="Homepage for the Kaleidoscope WordPress theme" rel="nofollow ugc">Kaleidoscope theme</a>, the Mini Quilt plugin provides a more colorful way of presenting your recent (or random) posts. It also provides–by virtue of the carefully selected color–your readers with implicit information about when those posts were written. Your widgetized areas have never been so good at letting your visitors know what other wonders your blog offers.

Mini Quilt

For drawing attention to your posts in the sidebar. It uses a colorful way of…

FourNodes Random Post vs Mini Quilt