A good article on geotagging in today’s New York Times that could stand as a general introduction to the subject: it explains how geodata can be assigned to photos, discusses the photo-sharing services that support it, and mentions a few of the hardware options. (GPS-equipped cameras are not widely available yet, so workarounds, whether hardware-based like Sony’s little gadget or manually adding location data to each photo, are required.) Via All Points Blog and About.com Geography.