What's a Good PayPerPost Alternative?

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Sites like PayPerPost is a good way to earn some dough online, but then, PPP asks you to link to their site and let your readers know that you are writing for them - which will hurt your blog's PageRank. So, what are good PPP alternatives that don't require you to mention that you're writing a paid post, so that it will look like a regular blog post? Any good suggestions?