Frappr is a concept we have seen before but now combines several options for a very advanced “community guestbook”. It lets you create a map of the world for your community where every member can place a tag on the world where he or she lives. Not only that but it also allows your visitors to leave comments and photographs. It currently has more than 1.000.000 members!
Another service is a little javascript which you can place on your website and which allows you to show a slideshow of all the photographs your visitors left on your website:
(I hope you will leave a photograph on my just created frappr map so the slideshow above shows some more pictures!)
The creaters have also a weblog which you can find here