I believe the plugin you are talking about uses the api on the content site called scribd dot com. The name is supposed to be misspelled, but is pronouced scribed by most people I have run across. I started using this site a few years ago when it was less than a year old. It was amazing. You could take a brand new page that had never been indexed and upload part of the content into their site with a link back to the original and in less than 30 minutes Google was adding it to the index. The link juice used to pull the scribd page up for low competition words to front page for a few weeks and as it fell off the page on your site would move up into its place. Now a days it is abused by link builders, but it still works for me. Just not as fast. Pages get indexed in 2-3 days on average and the low competition keyword stuff goes up to page 1 and falls off in 2 weeks or so as the original content moves up. If you are concerned about paying for it open a free account on their site and manually do it for a month and see if automating it would be worth it to you.
