I was just looking at Brad Callen's Article Submitter. (It looks like a great piece of software. There's a free and a paid version. You can find it via Google.) I think it would be useful in speeding up the process of article submission, but it has no spin option. So basically you have 600+ article directories, but he suggests that you send the same exact article to each one.
Wouldn't this cause a problem? I've heard a lot about duplicate content and the importance of making sure your spin is x% unique. How true is that?