[Google] confirmed that PageRank scores are being lowered for some sites that sell links.
In addition, Google said that some sites that are selling links may indeed end up being dropped from its search engine or have penalties attached, to prevent them from ranking well.
However, as Danny points, ironically while Google may deem text link selling as spam... they still allow them to advertise using Google
AdSense . And Google even has a rule right in their AdWords content policy saying “Advertising is not permitted for the promotion of techniques and services that would violate Google Webmaster Guidelines. This includes cloaking, keyword stuffing, search engine spamming, and doorway pages.”
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