One of the many benefits of Apple’s iPhone 4 is the beautiful Retina Display and if you wanted to edit your photos on a mobile device, you’d want to make full use of such a display. Now the folks over at Adobe have released the latest version of Photoshop Express for iOS, and the app has been updated to support the iPhone 4’s Retina Display, not to mention support multi-tasking for iOS 4.2. If you haven’t given the app a test drive yet, now would be a great time to give it a try.