Every time you modify a post slug, add a new post, rename a category, or otherwise modify any of your post and page permalinks, jadedcoder Sticky Permalinks (jcsp) will keep a copy of the original permalink along with the post or page it originally led to. If anyone tries to access the old URL, they will be redirected right to the new one, no matter how many times you’ve changed it.
If you re-use a URL that has already been used in the past, its copy will be replaced and it will safely link to the new article instead.
Don’t throw away valuable URLs! This plugin lets you re-organize your site as many times as you want, without risking traffic loss.

jadedcoder Sticky Permalinks

Keeps a history of your permalinks no matter what changes you make on your site, and redirects old links to the new ones.

preblogging

The best way to increase your traffic from Digg.com and StumbleUpon.com is to get more votes. Often you may have a great blog post, and people do visit via these websites. 
By providing a call to action. This call to action will greatly improve the number of positive votes you will get, and hence in the end you will get more traffic.
<h4>What is new in this version ?</h4>
In Version 1.3, there is the option to specify a your own site. And you can send these visitors a certain message also. Also there is a new test mode !

Increase Sociability

Increase the traffic from social media websites by reminding visitors to vote

jadedcoder Sticky Permalinks vs Increase Sociability