I recommend Kontera.  They are better.

Kontera Advertiser Benefits

Kontera’s advanced In-Text Pay Per Click Advertising solutions guarantee the highest degree of relevancy between content, keywords and ads.

Unduplicated Reach
Strong Relevancy and ROI
Higher Click-Through Rates

Infolinks

• Quick and easy setup with no changes to your website
• Ads are tightly integrated with your content – no additional space required
• Free sign up with no commitments or risk