Apple released iAd Producer 4.2 on Friday, giving developers the ability to display full screen banner ads in iPhone apps. iAds is Apple's own in-app advertisement system, and until now hasn't offered full screen ad support.
Apple ads full screen support to iAds Producer
The version 4.2 update also added the ability to upload projects to the iAd Workbench campaign management system, and added the ability to reorganize folders in the Assets bar, and more.
iAd Producer is available as a free download for registered members of Apple's Developer Connection program.