Backlink from articles still work as long as the content is unique and is not indexed as duplicate.
Its better to shuffle the title, content and anchor text as well.
Here's a thought for you . . .
If you write an article, and 1,000 people think its the cat's pajamas and want to add it to their sites, will you get a duplicate content penalty?
In fact, if your article is SO good that 1,000 people post it on their sites and give you credit along with your link, you not only develop Link Popularity, but you also create Content Popularity.
This is the kind of content the search engines look for when someone does a query for a keyword. If a whole bunch of people think its good enough to share with their readers, the search engines aren't going to argue the point.
Please, please, please . . .
Duplicate content only applies when you post the same content on the SAME SITE over and over in order to fool the index bots into think the site is uber-relevant.
Having your content on thousands of other sites is called Content Popularity.
This duplicate content myth is dead, and the only ones who benefit from it are the guys who sell the article spinning software.