Hello All,
Cartographer has been around for a little while and it’s a library
which makes building Google Map graphics and overlays trivial. I
recently updated it to support both Google Maps API v3, as well as
Rails 3. So go check it out ( http://grati.la/cartorbflw ).
Announcement of Cartographer’s new avatar on Ruby5 Podcast :
http://bit.ly/fSWCfh
Original announcement by me:
http://groups.google.com/group/bangalorerug/browse_thread/thread/bd4386c6a2805f51
write good code, be humble and live a great life 
Abhishek Parolkar - parolkar (Abhishek Parolkar) · GitHub
[1]cartographer : GitHub - parolkar/cartographer: Google Maps v3 on Rails