There are two problems most people find when creating wordpress autoblogging:
1. unique content (if you beat this one and make it look natural and wait for google to appreciate your blog, you hardly need any backlinks at all, i've done this before)
2. getting backlinks everytime you add new post to wordpress.
if you can overcome these two then your script will make money over and over again.
from what i see. unique content can be gathered using free articles or PLR articles or RSS feeds. But to make them unique, i found that using google translator and the like is the best solution for natural and readable content. so create script to make this automatic as a wordpress plugin will surely make money.
as for backlinks plugin i don't know what to suggest accept this: just get us the hell lot of backlinks!
I see a lot of plugins out there give you so many features (you don't even need) like Autoblogged but it lacks these two features. Also too complicate to use too. I don't see the point in posting duplicate content anymore. It is just silly in the long run.
The successful autoblog only need a lot of unique articles, frequently posting and only a few backlinks to be able to make 1000+ unique visitor everyday in 2 months.