JoshuaPack

Why choose this plugin?
<ul>
<li>404 pages not working? </li>
<li>Would you like to have a custom 404 page? </li>
<li>Would you like the 404 page to be a static page? </li>
<li>Do you need to have a WordPress CMS page as your 404 page?</li>
</ul>
This plugin does it!
This a rebel plugin that does not use WordPress’s 404 hook. It was developed for themes or plugins that cause issues with the hook itself.
For more information see FAQ page.

HTD 404

This plugin will simply allow you to point to a page to serve up if you get a 404 error. Also it marks it as 404.

jakubas

<a href="http://jakubas.net.pl/projekty/narzedzia/wp-skyscraper-plugin" rel="nofollow ugc">WP Skyscraper</a> is a wordpress plugin that allows you to add fixed box on your wordpress blog.
=With Skyscraper you can =
<ul>
<li>add fixed box on your site</li>
<li>change the color of text, background and border </li>
<li>change the inner html of fixed box</li>
<li>change the position and size of the box </li>
</ul>
Demo :
You can see a demo on my website : <a href="http://jakubas.net.pl/" rel="nofollow ugc">Jakubas.net.pl</a>

WP Skyscraper

WP Skyscraper is a wordpress plugin that allows you to add fixed box on your wordpress blog.

HTD 404 vs WP Skyscraper