I have a new content type Mindmap working now! You can create mindmap .mm files in Freemind and put them here on the site for other people to look at online via the Freemind java applet. It's pretty slick.
Couple of notes: do not put spaces in the filename for the .mm file. It's a problem with the java applet. I'm also not sure how or to whom we want to make mindmap nodes available; post a comment if you have an idea. For now, I'm just going to make a big list on the employees site.