1. This one is the best:
http://ezinearticles.com/
2. Also, instead of creating articles, think about creating pages on the web 2.0 websites:
squidoo.com
hubpages.com
They rank better in the search engines.
3. And lastly, find blogs about your topic. And ask them if you can guest post on their blogs. Being published on one good blog is much much better than being syndicated by 101 article directories.