The Good Locations iPhone app, available in the iTunes app store for free, enables you to easily capture a location with the built-in iPhone camera, add a comment, rate the location (good/bad) and commit the information to Nikonians servers. You can also set up your account through the iPhone to automatically publish locations to Facebook and Twitter.
There is more information and a small users guide on the Good Locations system in our wiki.
more detail: Nikonians News & Blogs