Mindmeister is a great mind-map-software with embedding features.

example link:

example

http://www.mindmeister.com/86212834/kurs-utlandsflyg

Their embedcode is an iframe

<iframe width="600" height="400" frameborder="0" src="http://www.mindmeister.com/maps/public_map_shell/86212834/kurs-utla..." scrolling="no" style="overflow:hidden"></iframe>