It's funny but amongst many creatives mind maps seem a little, er beneath them. That real creatives can somehow manage and edit thoughts internally. Mind maps are for management consultants. Mind maps are for wimps.
Sadly, I have to say here's another backlash, a reality check. Forget lists - too much hierarchy and ranking but good for analysis. Forget random scribbles - good and loose buut too unstructured and inneficient. Mind maps open your mind. Open your minds because mind maps really work.
There's an article in the latest Business week from IDEO's David Kelly here, that makes a lot of sense.
Of course there's tons of stuff on Wikipedia on the subject too.
Go on try it out. Planning a new website? try a Mind map. A new way to work out? Mind map it. Getting married... Kid's birthday... try a mind map. Open your mind.