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.