You could be in blissful ignorance about hidden SEO problems that are damaging your website or blog’s search engine rankings and, most important, reducing your search traffic.  There is a very useful free site called websitegrader.com that gives you a complete readout on your site’s SEO factors.  Did you know, for example, that if your domain name registration has less than a year to run that is a negative factor for your Adsense site?  I soon renewed my domains when I read that.  Have a look at websitegrader.com and see your score.