Quadrille - 9:27 am on Dec 20, 2011 (gmt 0)
The point of the web is that you don't NEED to rewrite Mary Smith's article - you can provide a link to it.
If you are discussing her article - maybe adding to, or dissenting with her content, then go for it.
But, currently, 99% - yes, 99% - of the web is regurgitated non-original content.
Call it what you like, but the test is - "Does this article have ANYTHING new to add?" or would I be better off writing something else and using a plain old fashioned hypertext link. To paraphrase, it's the age-old self-question "Am I publishing for people or for search engines?"
If you choose to have digital diarrhoea (simply a form of sick site syndrome), that's fine - but don't blame Google when they make an accurate diagnosis and send you home without your lunch.
Of course Panda ain't perfect - but it has got closer than anything Google have done before to separating the wheat from the chaff - and millions of miles further than Bing has even dreamed of - which is exactly why I'm always suspicious when webmasters praise Bing. Think about it ;)