There are some good geocoding plugins (like geokit), but can you recommend the googlemaps plugin for "presentation" in rails?
I used to use YM4R / GM, but I donβt know if it will still be relevant ...
I have always used GeoKit for all things in GoogleMaps ... it's a little old, but all the source codes for "Getting Google Maps Applications with Rails" are available at http://googlemapsbook.com/source/ . This should be well thought out how to write code for the interface. Advanced Rails Recipes also contains great code recipes for creating geocoded points in GoogleMaps.
Looking at Github, I found google_maps plugin. I have not tried, but it is normal.