RobotPoster is a Wordpress Plugin, that post automatically unlimited number of posts on your blog via RSS from many site web that you want ; This plugin give for you a CSS3 Button in Widget to start the automatic posting operation with two type : the first you load by every click and the second you click and the timer load and post after some time.
Demo: http://codecanyon.net/item/robotposter-wordpress-plugin/4050248