How to Increase eCPMs

1.

Compare the performance of the same ad in different places.

Analyze the placement and performance of existing AdSense ads on your site. Since Google measures the click-through rate of ads in its calculation of how to compensate publishers, you should publish ads where your users notice. Click on them. As Keith D'Souza advises, you can analyze this behavior by using AdSense Channels to monitor the performance of different ad positions, ad sizes, and ad formats. AdSense allows you to show both display and text ads. Experiment with each format to see which leads to more user interaction. Display those ads.
2.

Give your existing audience more enjoyment.

Incorporate strategies to make your site 'stickier' for existing readers. this will create more impressions from the same audience. Noted blogger Amit Agarwal suggests adding a search box to the top and bottom of every page on your site. Similarly, Darren Rowse of Problogger suggests you offer conspicuous subscription options to your readers. Rowse also suggests increasing interactivity by adding a subscribe-to-comment feature and by responding to comments yourself. This will create increased impressions from people following the conversation. Further, consider incorporating a related content section on each page so visitors easily can find more content that they enjoy.

3.

Make it easy for your audience to share your content.

Get increased traffic and, therefore, increased ad impressions by promoting your site. Integrate social networking links that allow your audience to share content they enjoy with their network. Also consider unconventional sources of traffic. As Amit Agrawal points out, if you publish some content to sites like Flickr, YouTube, and Twitter, you can garner new audience members for your content.
4.

Car dealerships spend more on ads than cafes.

Increase your ad revenues by targeting a more lucrative audience. All audiences are not equal, and since advertisers bid for ad placement on websites through Google, those advertisers with higher profit margins are able to bid more. For example, a car dealership makes much more per new customer than does a cafe. So if your content targets people shopping for new cars, your eCPM will be higher than a site targeting people looking for the best local coffee.