Hail-a-Taxi allows the user to find and order the taxi by one click from any point in the world. The service can be used as from smart-phone (iPhone for example) so from PC. The Hail-a-Taxi service will find your current location (or IP address) and immediately present the list of taxi stations nearest to you. Simple click on phone image will connect you to the station from your smart-phone to order the car.
Hail-a-Taxi site uses the Yahoo and the Google services which supply the data about existing taxi stations around the world.