A good rule of thumb Peter is to not duplicate published online articles (even if you're the original author). The reason for this is that it affects your SEO (Search Engine Optimization) ratings in a negative manner. Every search engine (Yahoo, Google, Bing, etc...) sends out crawlers to categorize your articles by keywords, relevance and content, and if they find multiples of the same article, they won't classify it as original causing it to fall lower in the search engines. The lower your search ratings, the less likely your article will be to be read. Hubpages has built in a "duplicate article" feature that alerts the author that his/her article is in danger of falling lower in the search engines. Hubpages encourages unique and informative articles and tries hard not to be inundated with spam, so for this reason they discourage submitting the same article to multiple sources. Hope this helps!