This is fantastic and there is great potential, but would be better with better accuracy on driving time, and also public transportation times worldwide. Also an important input is commute start times for each entered address (in case spouses start their work day different times). The above are all acailable through the Google Maps API.

I would happily pay $10 or more for an accurate customized commute map. The rational value is likely way higher for families looking for an area to buy in which good commute times for all.