Map Based Passwords

Not entirely sure i think this is a great idea but map based passwords have been proposed as an alternative to regular passwords.

Apparently a user memorises a spot on a map but i can't help feeling that a map of London is going to attract a large number of people choosing the London Eye as their location. This method makes shoulder surfing easier i would have thought as a quick glimpse of a map would probably show where a user has chosen, especially if the location is fairly sparse.

Still, beats users writing it down and sticking it on the bottom of the keyboard..........