The top 1 feature after the design is always the ability to sync with my other devices. In this case it might be a little bit of an overkill to have similar iPad and Mac apps, because I see the application for this apps more for the smaller "next action" tasks. However, I could imagine a feature where you can "drag" or "send" tasks from other apps, e.g., omnifocus one-way to the device.

Did u announce the winners??