The company that makes Scrivener has come out with a type of mind mapping tool for writers. Looks interesting, useful, and is modestly priced. But like Scrivener and any other writing software, there’s a fine line between productivity and a time sucking fascination with all the cool things it can do.
For me, the best bet is to open a simple text file, get the writing done in a distraction free environment, and transfer to Word or whatever later. Even Word with all it has can take up to 1/2 a day just on layouts and fonts. Be aware of these traps, and just write.