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I found this site useful and a real time saver. articlemarketer.com I signed up for $39 for 3 months unlimited article submissions. They submit to a ton of sites. I had one article get picked up over 200 times in the past 2 weeks. They are a little behind submitting right now but its worth the wait, plus they tell you how to optimize your article for better results.
The best way to find them is to search Google. That way you get a list of the ones that have the most valued and trusted links.