This could be an app that makes you relinquish control of your iPhone and see the nearest kid around you begin a lifelong journey in wildlife appreciation. The free Project Noah app lets you snap photos of a plant or animal and submit it to find out details on exactly what it is, and what it's good for.
Otherwise, the app takes advantage of the phone's GPS to show you plants and animals that are within your area, and if you're lucky enough to actually spot one, you can participate in one of the field missions set by various environmental groups or labs, and help contribute to their research.
So as you've probably gathered, this app is informative and fun (especially for the youngsters), but actually contributes something back to Mother Nature—knowledge, and hopefully protection of her wildlife. [iTunes]