They haven't yet. I've got articles all over the place and Google has at least 30-40 listings for each of them.
It's more a case of duplicate content pages on the same site that causes the problem.
There's no way for an SE to determine which site is copying another in terms of publication, if an article or other content lies on multiple domains, so they just list them both.
I even had a case where, for a brief period, an article of mine was the entire "content" of the opening page of coldfusion-tools.com . I reported it to Google, but the problem is they're running AdSense, so the owner of the site just switched to a different article and somehow has gotten away without getting banned. (Not that I really cared, they gave me the backlink and published my article legally...it's just spammy.)
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