Mindmanager 7 is due to be released on May 30 but I’ve been a using the beta version for over a month and I can tell you that it’s great. 

Mindmanager is one of my indispensable tools.  It’s great at organizing ideas.  I use it for general brain-storming and planning all the time but it really shines for me when it comes to sermon prep.  I don’t know how I ever prepared a sermon without it.  If you’re a pastor and you’re still working on your sermons in Word or something, drop whatever you’re doing right now and download the Mindmanager trial immediately.

BTW, while version 7 is great, any recent version will do for sermon prep stuff.