Geni: Your family tree, ajax style
Written by on January 17th, 2007 in Ajax News.
Geni is going social with the family tree. It must have a long way to get as much information as the LDS church, but they did a good job with the interface.
It looks to be using Prototype/Script.aculo.us and YUI components with a major sprinkling of Flash for good measure.
You can zoom in and out of the tree using sliders and drag and drop.
Source: Ajaxian
Original Article: http://ajaxian.com/archives/geni-your-family-tree-ajax-style