Zettalab

How cool is that when you cash on every single image and word on your blog!
How do you monetize about 100% of your blog content? Has never been easier! Start working with <a href="http://yepty.com" rel="nofollow ugc">Yepty</a> right now and watch your cashflow increase.
You’ve got everything you need to make it happen:
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with In-text ads you monetize your text-content
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In-Image ads brings you income with every image
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Slider and Ad-line unostentatiously displays ads to the visitors when they scroll the page
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Text Ads, Related Tags and Tag-Cloud allow you to increase your clicks and boost your blog earnings
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We love your blog visitors.
We are interested in having your visitors come back to your blog and never leave for your competitors. The higher the number of returning visitors of your blog the more you earn.
That’s exactly why the ad formats we offer keep your blog content clean and reader friendly while brining you substantial income through relevant pay per click ads displaying.
All of the ad formats are great-looking and have high CTR
Only relevant Ads
Yepty use the powerful contextual technology to select the ads. 
This will guarantee only relevant ad displays on your blog. Your visitors will only see the ads they are interested in and the money it brings will give you a substantial income.
With <a href="http://yepty.com" rel="nofollow ugc">Yepty Ad Network</a> you are guaranteed to have high per click income and on time payments. Start Now!
And receive your money every 1st and 15th of the month directly to your PayPal account
<h3>PHP Version</h3>
PHP 5.3 is preferred; PHP 4 is supported.

Yepty – Pay Per Click Advertising. Monetize Blog and SkyRocket Income with Relevant Contextual Ads

Let ALL of your blog content earn you money.

Automattic

INN Labs

This WordPress plugin gives site administrators a way to insert widgets such as ads, newsletter signups, or calls to action into posts at set intervals.
The plugin registers a configurable number of widget areas.
The plugin can programmatically insert these widget areas into posts when the page is rendered. This setting can be overridden on a per-post basis via a post meta box or a filter.
If the programmatic insertion doesn’t work for a particular post, users can choose to place specific widget areas at specific spots in the post using shortcodes or blocks.

Super Cool Ad Inserter Plugin

This plugin enables the insertion of widget areas in your post's content via programmatic insertion at display time, via a shortcode, or via bloc …

Yepty – Pay Per Click Advertising. Monetize Blog and SkyRocket Income with Relevant Contextual Ads vs Super Cool Ad Inserter Plugin