Geotagging means adding geographical coordinates to something (in this case photos) usually aided by a GPS. Looking at photos on a map and knowing exactly where they were taken literally adds dimension to the experience especially if it's someplace you're going to visit or would love to visit but won't be able to get to for a while.
There are a number of sites that enable you take a Geotagging photo tour including Google's Picasa, Yahoo's Flickr, SmugMug, Locr, and Everytrail.
Web Jargon Explained: Geotagged Photos
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