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If you haven't already, be sure to check out the geotagging feature of
Picasa. It allows you to tag photos you have imported into Picasa with a specific location using Google Earth. When you upload your photos to Picasa Web Albums, visitors who view your photos online can see where the images were taken in a Google Maps thumbnail. You can also share geotagged photos with others as a
KML file or simply save the information in your own private album.
This feature is pretty trick and super easy to use. Here is
an example from photos I geotagged over the weekend. Note the Google Maps thumbnail in the bottom left corner of the page.
Learn more about geotagging photos in Picasa.