Yo may have heard of Edge (meetedgar.com $50/month) or tweet Jukebox ($13/month) that allow you to create a que that will continue to feed your twitter account over and over. You set the schedule and it repeats the same tweets over and over.

A listener just told me about Tweet Wheel which does the same thing, but it's a plugin and it's $20 (a one time fee). Here is a video from the developer.