With all the shuffling that's been seen in the search engine world within the last year, the issue of obvious optimizing has become a hot button. The current line of thinking is that most engines (especially Google) are on the lookout for sites that purposely make an effort to optimize their pages in order to get high rankings. While this theory has not been proven, I agree that obvious optimization is not a good thing. Not exclusively because of what Google might think, but because of what your site visitors might think.