fonglh

Easily create an announcements news ticker on your website. Put up new announcements just like how you would put up a blog post. Use the [announcements] shortcode to display all your announcements in a page or post.
Customize the look of your ticker from the WordPress administration screens. An options page allows you to change the colours and size.

Announcements Ticker

Provides a shortcode and custom post type to display announcements using a jQuery news ticker.

Nikki Blight

The Scheduled Announcements Widget lets you add a scrolling list of site announcements, independent of normal posts and pages, to any widgetized 
area of your site, or to your theme files. Perfect for publicizing an event, alert, or notice that doesn’t require a full-page write-up. Announcements 
can be scheduled to run indefinitely or during a specific date range, and admins can chose between horizontal or vertical scrolling.
<h3>Additional Details</h3>
This plugin makes use of the JSColor library. The JSColor project is maintained by Jan Odv�rko and released under the GNU Lesser General Public 
License. See http://jscolor.com for more information.

Scheduled Announcements Widget

The Scheduled Announcements Widget lets you add a scrolling list of site announcements to any widgetized area of your site.

Announcements Ticker vs Scheduled Announcements Widget