Personally this would easily be worth paying $20-30 with some good developer support for changes and improvements. Theres also a large number of drivers just on my firm using android phones that would make use of such an app. I am a cab driver and would really like an app that would make use of the GPS for miles traveled against a costs table. Additional features that would be very useful also: *Large button stop/start *GPS fix indicator *Profiled day/night/other cost per mile manual or automatic dependent on time of day - configurable time span. *Collation of trips and costs for historic accounting *Manual entry for account jobs I've searched high and low already and just cannot find anything that will do this.