Matt Cutts recently released that a new Google algorithm change is happening soon that will sniff out sites that keyword spam poor content.
In order to provide better quality or more relevant results for searchers, Google is getting smart enough to find sites that only create content for ranking purposes instead of to provide information of use on a given topic.
One of the ways Google is identifying these sites is by unnatural inbound link patterns. Which means that if most of your inbound links to your site have the keyword phrase in them linking to the highly optimized for the keyword phrase page content, that would be unnatural and therefore raise red flags.
How to stay ahead of this and continue to rank well would be to “be aware” of your keyword phrases and use them as a starting basis for writing new content. But do not write simple useless content that is not going to be of interest to anyone just for the purposes of getting ranked.
Some other suggestions for avoiding this penalty would be to:
Written by Mark Stoffels