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we submitted XML sitemap yesterday..

Ranking above Wikipedia is the same as ranking about any other site.  You just need to be relevant with strong links and social social signals.  I have sites that rank above wikipedia on several topics because the sites are more relevant than the one Wikipedia page, but it really depends on the subject matter as to how easy it is.  But, once again, just treat it like any other site.

Thanks for reply. I did not have a chance to got to MozCon. What topics were most popular? I haven't used Press Releases in my SEO that is why I am kind of questioning that method.

I think that's what probably happened. They kept the link up until it got verified, then they dropped it. Most of the link directories don't do any follow-up after the initial approval.

Steer clear of duplicate content. If the article is a high quality one then in my opinion it doesn't belong in an article directory - it belongs on a blog or site with a solid readership who can then respond and promote it. If you're creating lower quality articles for the sole purpose of article directory submission then I would still say one submit the one, there aren't many benefits from duplicating this content.

Thanks...just learned about it yesterday. It is like $10-$12. I'm paying today. Thanks