Are the days of hopelessly waving one's hand in the air as occupied cabs stream past finally over? A new crop of startups is trying to make the experience of hitching a ride a lot easier, according to a recent New York Times report. While some ride-share services offer apps to help form carpools, these new car service startups create for-profit taxi networks based around flexible rates.Take SideCar, which debuted this week in San Francisco.