The so called Pediaphon is a web-based service which converts Wikipedia articles on the fly to spoken audio mp3 files. The service let your computer read out the Wikipedia for you. It establishes E- and M-Learning scenarios during activities like jogging and driving with mobile devices like MP3 players and mobile phones.
A first approach for a Android Pediaphon App:
Link to the App in the Android Market.
iPhone App coming soon!
In the meantime use the HTML5 Web-App with the iPhone / iPad!