DriveSafe.ly is still in Alpha and only on jailbreak at the moment. At some point they will release it via the app store, but without backgrounder, I’m not sure how useful it is. The app is simple enough; every 5sec or 1min it checks for new SMS messages. If a new message is found, it converts the sender’s name and message to voice and plays it on the iphone. Natch! The app is still a touch buggy and it does not always work for me, but in the one ‘real’ use case, it proved useful. I normally do not ride with earphones unless it a long ride and if that long ride is mostly freeway. However, I agreed to meet a friend at a Thai restaurant in the Palo Alto after work. I work in San Francisco. So I turned drivesafe.ly on, set it on background, pulled up my ‘ipod’ and took off. BTW, I only use 1 ear plug when I ride, its the law in California. So 2/3 the way down, I got an SMS asking ‘are you here?’ Seems I miscalced my riding time and had to pull over to SMS back that I would be 15 min late. Perfect! That is EXACTLY what a SMS to voice app is great for.
I'm still playing with this,so more information here..