Just managed to get this blog post written and rescued from the 'drafts' pile..
The application is called Do Some Good, and has a range of short actions that can be carried out using an iPhone.
One of the activities that is included on the app is the Love Outdoor Play campaign, which was developed by Daniel Raven Ellison of the Geography Collective.
Install the free app and you can add to map of places to play.
I like some of the other options too: an easy way to do some good in a few minutes...
Also a chance to vote for Love Outdoor Play in the MADs blog awards.