Even though I have a commercial version I bought before, I use freemind all the time at work.  I have so many processes, many I only do once a month or less, I can't remember the procedures.  So everytime I learn a new one I record it in freemind.  After a year I'm building up quite a knowledgebase.  I also use it to manage and publish a hypertext set of links for our accounting office.  Thanks for everyone's hard work!  Al