http://geokit.rubyforge.org/
https://github.com/joshuamiller/cartographer/tree/master/lib/v3/cartographer
http://thasulinux.wordpress.com/2011/05/10/google-maps-in-rails3-application-sample-application/
http://thasulinux.wordpress.com/2011/05/10/google-maps-in-rails3-application-sample-application/