I was wondering if anyone happens to know of a jQuery (or pure javascript) mind map. I found this one a few times, but it uses MooTools, unfortunately.
I decided to port the one you found into a jQuery plugin, which can be found LINK REMOVED - SEE EDIT.
Edit: I've contacted the author of the original Mindmap, and my jQuery conversion has become the core of development. You can get it, as well as speed improvements and new functionality here, on the Github page.