Content sites are paid a flat rate per month per ad sold. I'm trying to get more details now from the company, but there is more on this here and here.
Google has been very clear that selling such links that pass PageRank is a violation of our quality guidelines. Other search engines have said similar things. The Federal Trade Commission (FTC) has also given unambiguous guidance on this subject in the recent PDF at http://www.ftc.gov/os/2008/03/P064101tech.pdf where they said Concerning Use of Endorsements and Testimonials in Advertising and the FTC's guidance on word of mouth marketing, presentation of search results is a function of paid placement,
oakley sunglass Understand SEO - BusinessWeek, and, similarly, that consumers who are paid to engage in word-of-mouth marketing must disclose that fact to recipients of their messages.
Oh,
Multilingual SEO, Internet Marketing Optimization Company, SEO web design, multimedia Norway, global multilingual SEO, but you say your blog isn't in the US? Maybe it's in the UK? Then you'll be interested in
http://www.opsi.gov.uk/si/si2008/uksi_20081277_en_5 # pt11 which covers unfair trade practices and specifically mentions in the content or by images or sounds clearly identifiable by the consumer (advertorial ).
But you're not in the UK? I believe many of the unfair commercial practices directives apply through Europe, eg http://ec.europa.eu/consumers/rights/index_en.htm to prohibit misleading or aggressive marketing.
The reality is that accepting money to link to / promote / market for a product without disclosing that fact is a very high-risk behavior,
Search Engine Marketing SEO - iValue.be, in my opinion.
Update: Google's Matt Cutts emails:
New York-based advertising firm MediaWhiz, never one to worry about gray areas when it comes to advertising,
oakley sunglasses, has launched a new product today called InLinks.
It's fairly straightforward - advertisers who want their sites associated with specific keywords simply buy ads. Links to those sites are then added to publishers sites whenever those words pop up in content. These aren't ghost links like Kontera and others include in content - they're full blown links without any notation (like a nofollow) that they are advertisements meant primarily for SEO juice.