For today only ComeawayWithMe are giving away free their iPhone application. The application is an audio guide to over 150 London landmarks.
The application includes over 6 hours of professional quality commentary on London's top landmarks. Each location has around 3-4 minutes of audio that includes interesting facts, tips and history.
The application is location aware and uses Google Maps to show the location of the audio guides closest to your present location.
Remember, the application if free to download today only!