Apple this past June rolled out iAd Workbench, a service which enables developers to build targeted ad campaigns for their apps while also providing them with tools to easily create ads.
Apple describes the service thusly:
Reach millions of iOS users with iAd Workbench, the simplest way to create, manage and optimize ad campaigns to promote your apps. Get started in just a few simple steps. Select the right audience for your app and set the best price for your business goals. Build customized banners in minutes. Track your campaign performance and drive downloads at the cost that works for you. From start to finish, iAd Workbench puts you in control.
