Alex

This plugin ensures that there is only one sticky post published to the site. When a new sticky post is published, previous the ‘sticky’ flag is removed from any other posts, so they will no longer appear at the top of your page.
<h3>Important Notes</h3>
<ul>
<li>I adapted code initially found at http://craiget.com/one-sticky-post-in-wordpress/ Thanks to Craige for posting it! Also, Devin Price (http://wptheming.com/) was immensely helpful as I knocked out a couple of issues regarding scheduled sticky posts.</li>
<li>The first time you publish a sticky post after enabling this plugin, any and all other sticky posts will be changed to not-sticky. There is not a way to automatically reverse this decision, nor is their a log of which posts were changed.</li>
<li>This plugin has not been tested with versions of WordPress prior to 4.0.</li>
<li>Do not use this plugin if you are using another to manage per-category sticky posts. It has not been tested with that setup, and it will most likely mark all of those posts as non-sticky.</li>
</ul>

There Can Be Only One

Ensures that there is only one published sticky post on the site at any given time.

Frank Neumann-Staude

English:
This plugin implements a new widget to use in the dashboard. 
The widget shows the sticky posts.
If they have more translations for this plugin, please send email to frank@staude.net, I will then install.
Entrys in the changelog with numbers means the ticket id on 
http://bugs.staude.net
Deutsch:
Dieses Plugin stellt ein Widget für das Dashbord bereit, das die Beiträge anzeigt, die die option “Oben behalten” gesetzt haben.
Wenn sie weitere Übersetzungen für dieses Plugin haben, bitte per E-Mail an frank@staude.net schicken, ich werde sie dann einbauen.
Einträge im changelog mit Zahlen verweisen auf die Ticket ID auf http://bugs.staude.net

Sticky Posts Dashboard Widget

The dashboard widget shows the sticky posts

There Can Be Only One vs Sticky Posts Dashboard Widget