iPhone and iPad apps tagged "virtual pinboard."
Pinboard Keeps Track of Notes Using a Familiar Interface
Every application won’t wow you. Some of them have one function and arguably do that one thing well. Pinboard is that application. Pinboard is a productivity app that lets you make notes on a virtual pinboard and drag them around the screen and arrange anyway you choose. Using it is not mentally taxing and learning to maneuver around in the app isn’t terribly difficult either.