My favorite thing about living in a city: not having to have a car. My least favorite thing about living in a city: not having a ride home and struggling to get a cab.
The free iPhone app Taxi Magic was made for me — and anyone else who ever needs to use taxis. The radical "magic" booking is one-click taxi ordering and is supported in 25 major cities. For cities that aren't on the list, Taxi Magic can still hook you up with the numbers.
Even if you don't take cabs a lot, at some point you may be traveling and need transportation, and guess who's gonna be your best friend when you're shivering on a lonely street corner, miles from your hotel?