I hadn't heard of Uber before but it looks to be a pretty cool service if you need to get around town and don't mind spending a few bucks doing so - maybe a service for business men/women? Essentially the Uber app will pinpoint your location and send a private car to pick you up. The app will even let you know how long until the driver will be with you - clever stuff.
The service is restricted to the USA and Canada at the moment but it is also available in good old London Town. Prices are not cheap hence why I think this will be a business service rather than a alternative to public transport. But with so many business folk still rocking BlackBerry 7 devices I'm sure the service does pretty well.