I've enjoyed trying the Eye-Fi Explore, a memory card that also tags digital photos with location data. It doesn't work flawlessly, but it's the easiest approach until cameras do the tagging themselves. Nikon has recently released a high-end model that does, but most people won't replace their camera just for that feature.
So expect more products like the Eye-Fi, which I described in an interview last weekend with WTOP:
LISTEN NOW: Geotagging Your Vacation Photos
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of 10:02AM December 18, 2008