Snapshots that do more than bore friends

Few sentences in the English language are more dreaded than this seemingly innocent offer: "Oh, I must show you the pictures from my vacation." Who wants to see endless shots of a friend lounging by a pool or in front of a monument, or--worse yet--their kids doing the very same things?

But, of course, those very same shots can be extremely useful when researching your own trip. How big is that pool? What, exactly, does the room at that five-star hotel you're thinking of booking look like? What's the crowd like at the so-called hot restaurant? It's good to have documented evidence from someone who has been there.

And recently, photo-sharing sites like Yahoo's Flickr.com and SmugMug.com have begun to let users add another dimension to their travel photos. Through a technology called geotagging, users can add GPS data to their pictures, which can then be plotted on a digital map. This not only allows users to see exactly where a photo was taken, but, when uploaded to an Internet map, users can also quickly browse a trove of photos that were taken nearby, providing a kind of scattershot collage of a place.