Joined: 13 Jun 06
24 Sep 09 11:40 pm
In some ways it really depends on the source of your content. If its PLR then absolutely rewrite it, the more the better, with 25% different being an absolute minimum.
For new content that you've written or had outsourced workers write for you then you want to be sure that is very unique. While you can use similar articles as part of your research simply copying chunks of the article regardless of how much you swap the paragraphs around, it will be seen as duplicate content since search engines use a shingling algorithm to determine duplication.
At the end of the day, while possibly the most expensive and time-consuming of the available methods for creating content, you can't beat a well-written article either done by yourself or a hired writer.