This plugin will display news/post from a specific category in a widget position with ticker(reveal) effects or fadeIn/fadeOut effects. You can manage
I had some really bad experience with it... modifying it proved pretty impossible, or at least much harder then it should be, but I thank the creator for their good intentions!
I ended up using the friendly Ditty News Ticker: http://wordpress.org/plugins/ditty-news-ticker/installation/.
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