Contextual advertising works because ads can be woven organically into site content. The beauty of Googles AdSense program has always been its capacity to monetize your website by dynamically inserting ads which are relevant to site content. But to achieve relevance and, for that matter — monetizing — you must develop a sense of organics. Ads should seem like resources to visitors, not ads.
BLEND THOSE COLOR PALETTES
When you generate your AdSense code, set up ad style and color palettes that match your content exactly. Not just close…exactly. To ensure perfect matches, enter the hex values of your sites colors in your AdSense palette. Match ad head colors to content head colors, ad body text colors to page content body text colors, ad background colors to page background colors. Make ad borders and frames invisible by coloring the ads frame and background to match the hex value of your page background color. Otherwise, your ads are announcing: Im An Ad! Visitors will try to ignore them.
Diminish the hue of the link URL to a lighter shade of your body text; e.g., if your ad text is black, color the link URL gray. You dont want to encourage surfers to type the URL directly into a browser window. You want them to click the ads heading. Thats how you get paid.
PLACEMENT
Organically blended text ads tend to pull better than banners because banners cheerfully announce themselves as ads, which people are subconsciously trained to ignore. But dont discount a judicious sprinkling of image ads because the right picture can be worth a thousand dollars. In our experience, the 336x280, 300x250 and 160x600 wide skyscraper formats tend to perform best. Make banners work with the compositional blocks of your pages, not dominate them. Dont stack banner upon banner. Visitors will scroll right past the noise.
Page length may dictate ad placement. On pages with brief content, placing ads above the content generally results in better CTR. On pages with lengthy content, placing ads near the middle tends to result in better CTR. Readers who are interested enough to hang in, tend to start looking for additional resources.
Use four- and five-link text ad units when you can. But dont compromise page content just to cram more ads on a page. Content, after all, is the point of a website.
Dont create an abominable website around a couple of high-paying keywords and slap AdSense ads in it. Content-challenged, Made-for-AdSense sites never prosper. Visitors will see though your ploy in three seconds. Develop websites which have value.
Dont stick AdSense units in odd vehicles. No pop-ups, 404 error pages, or otherwise empty pages.
Read Googles optimization tips and check the Google visual heat map for suggestions on where to position AdSense ads. But dont treat this advice as gospel. Track your results. Believe your patterns.
RESEARCH. ANALYZE. TWEAK.
Use filters to block low-paying advertisers. 3 cents a day at $.01 per click is not a living.
Do your keyword homework. The more narrowly focused your page content is, the more likely it is that your pages trigger will ads that your visitors will find relevant. The first lines of your copy are a key factor in triggering which ads will be served on the page. Optimize those lines, if possible, for the kinds of ads you wish to attract.
Set up URL Channels in your AdSense account. Channels tell you whats going on with individual pages. Tweak your low CTR pages. Tinker with page titles, enrich the content, narrow the focus and make the content keyword-rich. Mine the Top Queries report (in AdSense For Search) to pinpoint what searchers are searching for. Mining can give you ideas for tweaking copy or adding relevant content.
DONT CHEAT
Dont tinker with the AdSense code. You could unleash a nightmare.
Dont click your own ads! Google will eventually figure it out. Theyve trapped your IP address, for starters. Follow the AdSense policies. Youll make more money if you play it clean. I promise.