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I like the guest blogging idea for two reasons.  One, it builds links, and two, it allows me to add content to a lot of blogs that are really interested in growing a lot of good content.  But I often read articles that give credit to another article, that give credit to another article. I have been offered plenty of documents for client blogs, but I am worried that at some point in the future Google will decide all this guest blogging is similar to link trading and selling. What does everyone else think of guest blogging?