Outlining/mind mapping script similar to www.thebrain.com?

There is an outlining/mind mapping tool called "The Brain"
(http://www.thebrain.com), which does quite a decent job of displaying
objects and their relations as a kind of interactive map. You can
browse "idea spaces" travelling along child/parent/sibling
relationships. Their own site uses it as a navigation tool.

I wonder if some (D)HTML/JavaScript wizard has done a "white room"
implementation of this concept? I.e., is there a script that will
transform a regular outline into a screen presentation where the
"child" objects float around/below the parent object, where clicking
on an object moves it to the center etc.?

http://www.gnod.net is an implementation of this idea - check e.g.
http://www.gnod.net/music/related/Yes.asp . Im looking for a generic
script that will convert a nested list into this kind of presentation.