Ditlev introduced me to MindMap and now I am hooked.
I try a few different programs, but in the end decided to use the same App as everybody else in the office “MindJet MindManager”, the reason for me to start using it was I noticed that I was keeping way too much info on my head, I needed to start writing down some of the stuff I am working on, especially the Tera and VPS.NET projects, so once I started writing them down in a mindmap, it was just like releasing it from the back of your mind, felt good actually, less clutter in the noggin.
As I always say, every day you learn something new 
Try iBlueSky for iPhone. You can make map notes anywhere.
Already got it
.. very nice too