Princeton University Press has just announced a new APP of their field guide: Mammals of North America by Roland W. Kays and Don E.Wilson. For more info go here:
You need to scroll down a ways for the info.
UPDATE: To celebrate this inaugural app, PUP is giving one copy away on the app's new facebook page. Entering the giveaway is easy. All you have to do to be entered into the drawing is become a fan of the app on facebook - visit this page (http://www.facebook.com/#!/pages/Mammals-of-North-America/144382022315184) and click the like button. The winner will be announced this Friday, 26 August 2011.