The State of Duplicate Content
According to a number of search engine optimization experts, duplicate content (having essentially identical content in more than one online location) is a bad thing. My attempt here will not be to give my opinion or to conclude the argument one way or the other, but merely to catalog what everyone else is saying, and I'd like to enlist your help. I've posted a few references, please respond with any others you know of.
First up is Deftly dealing with duplicate content by Adam Lasnik, posted on the Official Google Webmaster Central Blog. The article covers what is and isn't duplicate content (as defined by Google themselves), why Google cares about duplicate content, what Google does about it, and how SEO experts, webmasters, etc. can deal with the issue.
SEOMoz covers Canonical Issues & Duplicate Content, Duplicate Content Penalties, and Rand adds his own comments on Adam's post.
William Slawski gives his two cents on Duplicate Content Issues and Search Engines. Actually it's more like 11 cents. #10 deals with article syndication where William says "Many people create articles, and offer them to others as long as a link and attribution to the original source is made. The risk here is that the search engines may filter out the original article and show one of the syndicated copies."
Todd Malicoat at Stuntdubl addresses How to Remedy Duplicate Content and Magical % Thinking where he points out that "If it was as easy as saying that any page with more than 42% duplicate content will be filtered from the search results, then all site owners and SEO’s would probably grab 40% duplicate content for every page filler." Also check out his Top 16 Reasons People Hate SEOs.
Got any other resources on SEO and duplicate content? Please comment.

