Map Based Passwords

smitty777 writes "Discovery is running an article on passwords based on a very specific location on a map. Instead of showing UID and Password fields, the user would simply click on a very specific spot on Google Earth, for example. I wonder how you would make that secure? Also, if you forgot, would you get a message saying 'Your password is the third flamingo on the left on the lawn of Aunt Bessie's house'?"