Because you can insert a photo from your camera roll as a back ground you can set up all kinds of sorting, arranging and graphing activities for students. It is super easy to search Google Images or other sources for a background image or take a photo of a worksheet and set it as the background to the activity.
You can then used colored cards, cards with words on them, symbols or photos as the manipulatives you move around on the background. You can create graphs using blank colored cards or create math activities. You can use real life photographs to create sequencing and retelling activities. You can use pictures symbols (saved to your camera roll) for Talking Mat style activities. You can take a screen shot of the final products and you can use for portfolios and assessment.
The iCardSort website has a Public Decks you can download from their site including dolch words, numbers, alphabet and more. There is also a manual and video tutorials on YouTube.
There are a few things I would like to see updated on this app. I would like to be able to have text and an image on a card without the word going across the middle of the card (work around - have the word on the images in your camera roll). It would be nice to be able to have different shaped notes - nothing fancy - just squares. And in my wildest dreams if you could record audio on the cards that would rock.
I should note you can do similar things with much less expensive apps like Notefuly, maybe not as easily but you can do it.