Beautiful. Something oddly fun about fluid draggable objects. Kept me occupied for a good 10 mins. Maybe useful as an idiot detector as well :P

Here is the demo: http://kenneth.kufluk.com/google/js-mindmap/

Red over Green!! Aaaaargh! My eyes!!

Similar project: http://arborjs.org/

Cool Demo: http://arborjs.org/halfviz/#/the-abominable-snowman

I used arbor.js a a few months ago to make a graph of my facebook friend's connections, and it was really easy.

Hah, this is a lot more fun than generating dot files. I should do Twitter mentions again. http://pepijndevos.nl/2010/03/tweet-o-graph

ThoughtMuse is the nicest javascript mindmapping tool that I've seen: http://thoughtmuse.com

I hope it adds collaps and expand :P