Sometimes it's just best to call a car service ten minutes before you're ready to leave. Since people no longer use their phones for phone calls, a variety of smartphone apps have popped up to assist you in ditching the last vestige of human interaction New York had left.
E-hail apps are still relatively new and sprouting up more by the day, so it's too soon to tell which will be the Facebook of taxicab programs and which will be the MySpace. (And which poor bastard will be the Friendster.)
Regardless, these are probably the future of hailing cabs, at least for the few remaining years we still need to go out and do things in person. Keep in mind that as soon you order a taxi via phone or app, twenty available cabs will drive right past you, like black flies in your Chardonnay.