This is a great idea and I hope people will continue to add new spots. I just found there a nice location I was not aware of, just very close to a place I often come.
It might be nice to convert it to the Google Maps format that allows much more features like zooming or satelite photos (similarly like the
DeeperBluePeople database on Frappr). Google Maps API is available here:
http://www.google.com/apis/maps/
However, I am aware that working on such site and maintaining it costs a lot of time and brings no income, so redesigining it is certainly a hassle. It is not too important though - the site is great in the current form too!
Thanks!