The Warmshowers iPhone app is now available for download! You can download the app by visiting the App Store and searching for "warmshowers", or by clicking this link: http://itunes.apple.com/app/warmshowers/id359056872?mt=8
The app lets you visualize on a map the location of available hosts in your vicinity, mark them as favourites (for easy retrieval later), and get in contact with them.
The app is 100% free. Enjoy!