I just saw the video for this plugin and immediately purchased it!
Dev Rocket is a panel plugin that helps you with designing apps for iOS. It pretty much looks like a panel with actions and workflows to ease the process. From designing for two resolutions using one canvas, help with icon design, easily creating Ui snips and easy save for retina displays, if this plugin works good, it is totally worth the $10. Check it out at http://devrocket.uiparade.com/