The ZiYa Team has published an intro to ZiYa video.
ZiYa is a rails plugin that you can use to add charts to your
rails application.
ZiYa Links:
Video - http://www.youtube.com/watch?v=axIMmMHdXzo
Home - http://ziya.liquidrail.com
Group - http://groups.google.com/group/ziya-plugin