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.

AndreSC

AStickyPostOrderER lets you customize the order in which posts are displayed per category, per tag, or over-all, in WordPress 2.3+ blog.
Useful when using WordPress as a Content Management System.
Now with the ability to override itself.
<h4>How to:</h4>
Once the plugin is installed, go to “Tools”, “AStickyPostOrderER”.
The plugin displays a list of your categories as well as a list of tags in use. 
The category and tag names are links (used to make ‘Sorties’) each followed by radio buttons and a Limit field.
Sorties: Click a category or tag’s name below to manually create an order of some or all of its contained posts to be shown before the default ordered posts in that category or tag, or re-arange all posts as they apear on home(index) and archive pages.
(Please Note: You have to individually set order for each category or sub category you want to order posts in, if enough people express it as a requirement I’ll add functionality for the plugin to propagate order set in the index view to either all- or specific categories tags. Mail me if you need this.)
AND / OR
Meta: Use the radio buttons to specify meta-stickyness, respectively:
<ol>
<li>
Super-sticky: Show before anything else (you can set a limit for how many posts from this cat or tag should be given this preferential treatment, e.g. if you want the latest post with the tag ‘events’ to show before anything else in any category listing that contains that post place 1 in the text field next to the ‘events’ tag and set it’s radio button set to ‘Super-sticky’ )
</li>
<li>
Sub-sticky: Show after individually ordered posts (‘Sorties’) for given view but before un-sorted posts
</li>
<li>
Default: Treat normally (except for individually ordered posts)
</li>
<li>
Droppy: Show only after everything else 
and remember to click ‘update meta-stickyness’ at the bottom of the page for your changes to, ahemmm, ‘stick’ . . .
</li>
</ol>
<h4>Override</h4>
If you want to have posts listed without the customised order you can do that by having ‘?aspo=vanilla’ in the url, or if you created a listing with query_posts add aspo=vanilla, eg. ‘query_posts(‘cat=13&showposts=10&aspo=vanilla’);’

AStickyPostOrderER

Lets you manipulate the order in which posts are displayed per category, per tag, or over-all.

There Can Be Only One vs AStickyPostOrderER