Good question. The best place to start would be Google's guidelines. Read them carefully ... and do the opposite
OK, it's not as simple as that. I'm open to suggestions. The easy option would be to go for tons of nofollows. But that could backfire when Google eventually recognises that nofollow was a bad idea in the first place and changes completely how they treat them. Don't be surprised if they just scrap it altogether and treat all links as equal once they've achieved their objective re getting webmasters into the habit of disclosing paid links (the ulterior objective all along). When that happens your tons of nofollows could propel you to the top of the SERPs. Ouch!
Any other suggestions?
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