Tired to waving your arm like it's the 20th century? Embrace the total lack of stillness that is the defining element of the 21st century with the Zabkab taxi hailing app. All kidding aside, it does look useful. Cab drivers will pay $10-$15 per month to be hooked up to the service which will display GPS beacons on the spots where people are waiting to be picked up. From a consumer point of view, it's just another free app that makes life easier when on a less travelled street.