Although it got off to a rocky start, Apple's iAd service is now the second-largest such service online, behind Google. The program has quietly but slowly improved over the years, and the improvements have now filtered through to a new major version of iAd Producer, the program that allows artist to create both typical iOS ads as well as the elaborate, beautifully-produced promotions that have become a signature showcase of Apple's approach to advertising. The new version, 4.0, improves nearly every aspect of the program.
