Frustrated with overcharging taxi/auto drivers and faulty meters, Tuk Tuk Meter Android application might be useful to you. Kerala based Mindhelix Technologies has launched this auto fare calculator application for Indians.
The application does not require data connection, and works on your phone GPS to calculate the distance and comes up with the right auto fare. The application however does not come with any pre-entered auto charges, so you will have to feed rates in your city first to use the application.
I hope the developers add these in the upcoming updates. Application is right now available for free in the Android Market.