The recent Pandalabs report on the targeted attack by spammers on Ford makes interesting reading, and the video on how the blackhat techniques work is well worth watching. The purpose of the techniques are to lead unsuspecting users to malware or rogueware, and extort money and credit card details from those users.
Other recent rogue blackhat software campaigns show that the spammers are targeting an extraordinary variety of keywords ranging from fairy tales to health issues, and are being utterly unscrupulous in how they con the user into parting with their money. (See video: pop up window to simulate a secure session).
As SEOs, it is important to be aware of how professional these sites can be made to appear and how they have successfully (to date) conned the search engines. Your competition on the SERPs is no longer just a similar business, but fraudsters and criminals who are seeking to steal your traffic and business. As an internet user, it is vital to be extremely careful when trying to escape from such a site as even an innocent looking video that 41 other people have apparently bookmarked may well not be what it seems.