AdPress is a premium plug-in to manage Ads. Its a powerful and fully featured platform to sell and display ads for your WordPress blog.
This premium ad management WordPress plugin from CodeCanyon allows you to package and sell ads by duration, clicks or impressions giving you lots of control over how long to display ads on your site. When selling ads you can either set the plugin to auto-approve transactions or set them to pending until you approve or reject them. This raises the possibility of letting the whole process run by itself on autopilot as AdPress is capable of collecting payments thanks to its PayPal integration.
Product page: http://codecanyon.net/item/adpress-wordpress-ad-manager/1510785