Asvin Balloo

This plugin will add a “Back to top” icon automatically to your blog. It features a smooth scrolling effect and customizable options such as the color, position and scroll duration, sprinkled with some cool CSS3 effect.
By <a href="http://htmlblog.net/" rel="nofollow ugc">Asvin Balloo</a>.
Supported features:
<ul>
<li>Smooth scrolling animation</li>
<li>Customizable options via the admin panel</li>
<li>Works on almost all browsers</li>
<li>No need to add any markup to your theme</li>
</ul>

WP To Top

This plugin will add a "back to top/ scroll to top" icon automatically to your blog.

rpetersen29

This plugin makes it easy to display a simple announcement banner or bar at the top of your website. You can easily customize the color of the links, text, and background of the bar from within the settings. You can also customize to your heart’s desire by adding your own custom CSS. There’s also a fancy preview section within the settings so you can see your changes before you save them.
<h4>Now with multi-banner support</h4>
With Pro features you can display up to 5 separate banners on your site. Banners can be shown simultaneously or plan weeks of banners by showing them consecutively.

Simple Banner – Easily add multiple Banners/Bars/Notifications/Announcements to the top or bottom of your website

The banners created are embedded within the html of the page, so if you enter your html correctly they will be tab-navigable and placed nicely in the content flow.

Very easy to use, instructions were clear, did what my client needed with no extra bells & whistles. 

good solution for simple accessible banner

Display a simple banner/bar at the top or bottom of your website. Now with multi-banner support.

WP To Top vs Simple Banner – Easily add multiple Banners/Bars/Notifications/Announcements to the top or bottom of your website