37° 48.325' N, 122° 24.343' W, +30 meters altitude. That's the location of my desk in Technology Review's San Francisco office. Just enter the coordinates into your cell phone, and it'll take you right to me.

Unless, of course, you don't have access to your phone's built-in navigation features. Many new phones use the Global Positioning System (GPS) to determine their coordinates, which can then be transmitted to 911 operators in an emergency. But Sprint and Verizon Wireless, which both sell handsets with built-in GPS chips, have not yet given outside software developers access to this same location information.