Advances in technologies like GPS (Global Positioning Services) have made it cheaper and easier for cell phone manufacturers to build the hardware and software for location-based services into cell phones, or as Bluetooth-based add-ons for older phones.  GPS units have been a hit in the automotive industry, giving drivers mobile access to directions, traffic conditions, and travelers' information such as hotel and restaurant listings. 

Verizon has "VZ Navigator" while Cingular has TeleNav GPS Navigator services that provide consumers with turn-by-turn directions, maps, and local information on demand.  Will location-enabled cell phones be a hit?  Will they eventually replace dedicated GPS units in automobiles?  Until men decide it's okay to ask for directions when they're lost, I don't see why not!