The idea is similar to more established location based services such as Foursquare or Gowalla, but rather than sharing your locations via check-ins and then adding photos, you share a geotagged photograph through the iPhone application. You can download the free application here.
Once you capture a photo, geotag its location, and publish it through the app, your friends will be notified through their apps, the Mopho website, or Facebook.
The photo and location service spaces are both extremely crowded with 800-pound gorillas in each. I don’t think Mopho offers enough to rise above its competition, but it might succeed in developing a small, enthusiastic community of users like all the other services in the long tail of these spaces.