Apple has released iAd Producer 2.1, the latest version of its advertisement creation tool for its mobile ad network. First announced in 2010, iAd Producer allows potential advertisers to design and assemble rich interactive iAd content without any programming. Version 2.1 is a 66.8MB download, and features improved load and save performance, the ability to upload and test with iOS devices connected via USB, reduced device memory usage for image views,…