In addition to be present as a ride-sharing company in 200 cities, Uber is interested in on-call delivery services. Three pilots in the US: lunch delivery in LA, convenience store pickup & home delivery in Washington and a quick messenger service for Manhattan.
After Uber and UberX, now UberPool: car pooling made easier. According to the Uber site, on average UberX already costs 40% less than a taxi. Imagine reducing that cost by up to another 40% using UberPool (sharing a ride). That means an UberPool ride would cost about 1/3 the price of a taxi.