Most geotagging on Flickr is done manually and there are few, if any,
digital cameras with geotagging hardware built-in. Only recently (early
August) did Nikon announce a line-up of GPS-enabled point-and-shoots and
I'm certain that other manufactureres aren't far behind to take
advantage of the increase in Holiday Sales. But if you don't want to
buy a new camera just yet, you can pick up a standalone geotagging unit
such as the GPS Picture Tracker from ATP.