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