Cinemek’s Storyboard Composer is a bit pricey for an app ($20), but what an awesome tool to have in your pocket to quickly pull together a storyboard. Now I did not buy it yet, so i do not know first hand, but the whole idea of it looks very cool. You just have to check the video overview, it will blow your mind and it is all in your pocket. - Cornell
VIDEO -http://www.cinemek.com/storyboard/index.php