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.

qiqiboy

Show your random posts on sidebar and provide ajax refresh function. 
How to use this plug-in? It’s easy and you have two ways: 
1.Go to widgets page to add the widget to your sidebar. 
2.use the function <code><?php WP_Ajax_Random_Posts('number=8&cmtcount=1&excerpt=1&length=100&auto=0&time=60'); ?></code> to custom the posts display position. 
This function accepts six parameters: 
 number: how many posts display. Type: Integer, default 8 
 cmtcount: display comments count of the post. Type: Boolean, default 0. 1: yes, 0: no 
 excerpt: display excerpt of no. Type: Boolean, default 0. 1: yes, 0: no 
 length: the length of the excerpt. Type: Integer, default 100 
 auto: auto refresh random psots list or not. Type: Boolean, default 0. 1: yes, 0: no 
 time: the auto refresh interval(seconds). Type: Integer, default 60 
显示一组支持ajax自动刷新的随机文章列表。 
如何使用插件呢？很简单，有两种方法： 
1.到小工具页面去添加小工具。 
2.使用自定义调用函数<code><?php WP_Ajax_Random_Posts('number=8&cmtcount=1&excerpt=1&length=100&auto=0&time=60'); ?></code>

WP Ajax Random Posts

Show your Random posts on sidebar and provide ajax auto refresh function.

FourNodes Random Post vs WP Ajax Random Posts