Cristescu Bogdan

You can bring on the first page or any other page, for the new visitors, the old content.It’s no need of the question why should I do this because you want that your visitors could have in their view your older articles.
What does this plugin bring new?
Other plug-ins are already doing a great job about random posts, but for me was not important to show just a list of a few links to my articles; not just a random generated list, with some titles. For some new visitors, the article’s content is more important than the title, actually, for anybody this statement is true . 
So, I created this plugin to mark out even some text from the random article.
<h3>Others</h3>
For further information, visit <a href="http://blog.121416.co.cc/wordpress/wordpress-plugin-single-random-post-with-text/" rel="nofollow ugc"> Plugin page </a>
I will be glad to answer to your questions and I aspect any sugestions to made more usefull this plugin!

Single Random Post With Text

This plugin adds a new cover for the old content of your blog.

Fubra

ray.viljoen

The plugin provides a sidebar widget with customisable title and number of related posts to display. 
The widget will display a random list of x number of posts ( selected in widget options ) together with a small tag including the publish date and author. 
If used outside of a specific category the widget will default to all categories, whilst still displaying the selected number of random posts.
Developed by <a href="http://www.catn.com" rel="nofollow ugc">PHP Hosting Experts CatN</a>

Random Related Posts

A simple sidebar widget to include a custom number of posts from the same category as the current post.

Single Random Post With Text vs Random Related Posts