I forwarded this to Noah a while back, but I'd like you all to see it.
Keep in mind, this is just a demo. It isn't plugged into a backend or anything like that.
The link to family_tree that Private User listed seems to be broken now.
Sproutcore is a way of doing graphics, and has a number of demos at
http://showcase.sproutcore.com/ such as the different kinds of image scaling that it supports at
The WikiPedia article is good: