WebTicker is a simple jQuery ticker plugin. It can be use as a news ticker too.
It's free to use and it has some options for customizing.
Smooth Div Scroll is a jQuery plugin that scrolls content horizontally left or right. Smooth Div Scroll does not limit the scrolling to distinct steps. There are no other buttons or links on outside the scroller since the scrolling is done using hotspots within the scrollable area, the mouse wheel or via autoscrolling. Unobtrusive and smooth is the key here.
jQuery Marquee Plugin converts a list element into an ESPN-style scrolling marquee. Messages are scrolled in from top or bottom (based on the yScroll option) and longer messages will then ticker to the left in order to show the full message.
jQuery News Ticker is a lightweight, stylish, easy to use and flexible news ticker to jQuery.