Panoramio is the photo repository web site Google acquired back in May of this year. Panoramio lets people use Google Maps or Google Earth to view the locations of photos uploaded to the site. Since Google started helping Panoramio by showing them in the Geographic Web layer of Google Earth, the site has exploded in growth.
The Panoramio blog recently announced there are now over 5 million photos in their repository. Two million of the photos are viewable in the Geographic Web layer. Panoramio has a team of people who make sure photos are approved before they go in the GW layer. You can view all 5 million of the photos using the Panoramio Google Earth network link . The network link shows you a subset of the photos according to your current view. As you zoom in to a location you’ll see more of the photos for that specific location.
You can also view the photos in Google Maps like a layer by using the Panoramio My Maps gadget. The same technique of viewing photos based on your current view is used with the gadget. According to a Panoramio blog post, Google Maps now does a better job of showing lots of picture icons.