Automated method of posting to free PR sites?

I am a auto blogger dealing with so much daily content that it is getting hard to promote and get more traffic in a automated way.

I am currently looking for a automated way to help syndicate my content more. I want to repost my content to as many free PR sites and article directories as possible. Anyone know of a plugin, service (pay or free), or other method to spread my content to as many places as possible?