In google adsense blog they warning us about this. AGAIN. Google search Search Quality Evaluator – Ambroise Fensterbank – write on Friday, July 11, 2008 about : A good start to optimizing your site for Google search. There also a youtube video as a guide, here is the video from that post.

The important part of this SEO Tips is :

Ranking in Google search is based on many different algorithms, and optimization for search is a long, continuous process. For these reasons, and because the techniques might violate our guidelines, we recommend avoiding any techniques that claim to optimize your ranking very quickly or radically.