Hello Again & Thanks for your responses.
Well, while there are some generic concepts that you suggest me to follow, such as "quality links", "quality websites", "authority" etc, I don't see the point in them, they're all theory and let me explain why.
If you see google unable to recognize some of the MOST obvious spam tactics, where's the point in talking about "authority" & "quality" links? Some examples:
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Most of the links come from the footer section of the websites
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Most of the links come from blog comments and forum profiles
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Most of the links come from websites with no relation at all with the publisher's website. For instance, the website is talking about furniture, and most of the links come from blog articles that talk about CSS Techniques, Iphone and technology.
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Several links are stuffed nearby hunders of others links, in sections of the website called "partners" & "friendly websites" (obvious paid links sections)
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Several Directory links
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Spiky Link growth "from zero to hero" in 2 weeks
Well, the only thing I can think about Google's failure to recognize this obvious spammy tactics, is that most of the links come from "authority" and high page rank websites. The spammer did a good job recognizing (and buying) "authority" and "trusted" links, that gave him the advantage over the competition.
We have already reported the spammer, however I don't think Google has the resources to solve this kind of issues. Especially when we are not talking about Google.com