Do you have a technique that works great, but Google will penalize it? Maybe you want to run some popups, redirects, DIV image layers showing arrows and additional advertisements, iframes, etc.. Cloak? Cloaking can be risky, few do it correctly. You don't need to cloak. Just build a wall around it. Google can't see past the wall. Let me explain.. Set up referral-click actions and only fire these actions when the traffic comes from a (NON-Google) paid source. 7search, Bing Adcenter, other PPC networks, CPM ads, you get the idea. These should all be no--follow and Google won't be clicking them. Google will do a lot of things, but they will NOT visit your site from a link that costs you money and the link is no-follow. Post up if you want the code. I have it around here somewhere.