Kayaking, social photo sites and geotagging

Courtesy of Slashdot, I came across this article on Snapshots that do more than bore friends, about the addition of metadata, particularly map-locations, to photographs. Seems to me these services offer a great way to scope out the features (put-ins, pull-outs, sights, hazards) of new paddling places. Panoramino is a photo-site that concentrates on landscape.