The WP AricleFeeder plugin for WordPress is a simple yet powerful auto-posting plugin that enables you to define future posts in your blog in batch files.
Just fill out the simple form and schedule the frequency the articles are published. With options to select a defined intervel, start date and the author.
Then select the zip file containing the article .txt files and click process, the plugin then upload and schedule all the articles for future posting!
BONUS: Included with the plugin is 13,000 plus PLR articles in over 500 different niches.